500+ Chemistry MCQs for Test Preparation with Answers

Chemistry MCQs for Test Preparation with Answers

This collection of 500+ Chemistry MCQs is specially designed for students preparing for engineering, medical, university entrance, and competitive examinations. It covers a wide range of important chemistry topics including physical chemistry, organic chemistry, inorganic chemistry, atomic structure, chemical bonding, equilibrium, states of matter, electrochemistry, hydrocarbons, and industrial chemistry.

The MCQs are carefully prepared according to the latest examination patterns to help students strengthen conceptual understanding, improve analytical thinking, and enhance problem-solving abilities. Each question is provided with the correct answer to support effective self-assessment and revision.

Regular practice of these MCQs can significantly improve accuracy, speed, and confidence required for high performance in competitive exams. Students are encouraged to review mistakes carefully and focus on understanding concepts rather than memorizing answers.

Preparation Tip:
Consistent practice, conceptual clarity, and smart revision are the keys to achieving excellent results in chemistry-related entrance examinations.

500+ Chemistry MCQs for Test Preparation with Answers


The order of a reaction is determined by:
A) The stoichiometric coefficients of reactants
B) Experimental data
C) The activation energy
D) The temperature
✔ Correct Answer: B) Experimental data
The First Law of Thermodynamics is a statement of conservation of:
A) Mass
B) Energy
C) Momentum
D) Charge
✔ Correct Answer: B) Energy
Hess's Law states that:
A) The total enthalpy change is independent of the path taken
B) The total enthalpy change depends on the path taken
C) Enthalpy is not a state function
D) None of the above
✔ Correct Answer: A) The total enthalpy change is independent of the path taken
In an adiabatic process, the heat exchange (Q) is:
A) Zero
B) Positive
C) Negative
D) Undefined
✔ Correct Answer: A) Zero
Which of the following is a state function?
A) Work
B) Heat
C) Enthalpy
D) All of the above
✔ Correct Answer: C) Enthalpy
One is not inorganic?
A) NaCl
B) CO₂
C) CH₄
D) HCl
✔ Correct Answer: C) CH₄
1 mole of a substance contains:
A) 6.022 × 10²³ atoms
B) 1 gram of atoms
C) 6.022 × 10²³ particles
D) 1000 particles
✔ Correct Answer: C) 6.022 × 10²³ particles
Ethanol + PCl₅ reaction gives:
A) CH₃CH₂OH
B) CH₃CH₂Cl + HCl
C) CH₃CH₂Cl + H₃PO₄
D) CH₃CH₂OH + Cl₂
✔ Correct Answer: C) CH₃CH₂Cl + H₃PO₄
In "add 1 spoon of sugar in tea", solute, solvent, and solution are:
A) Solute: Sugar, Solvent: Tea, Solution: Sweet Tea
B) Solvent: Sugar, Solute: Tea
C) Solution: Sugar, Solvent: Tea
D) All wrong
✔ Correct Answer: A) Solute: Sugar, Solvent: Tea, Solution: Sweet Tea
Penrose formula relates to:
A) Atomic number
B) Gas law
C) Brain structure
D) Bond theory
✔ Correct Answer: C) Brain structure
Mass of a proton is:
A) 1.67 × 10⁻²⁷ g
B) 1.67 × 10⁻²⁷ kg
C) 1.67 × 10⁻³ kg
D) 1.67 × 10⁻²⁴ g
✔ Correct Answer: B) 1.67 × 10⁻²⁷ kg
Permittivity of free space (ฮต₀) is:
A) 8.85 × 10⁹ C²/N·m²
B) 9.81 m/s²
C) 8.85 × 10⁻¹² C²/N·m²
D) 6.63 × 10⁻³⁴ J s
✔ Correct Answer: C) 8.85 × 10⁻¹² C²/N·m²
SI unit of heat is:
A) Calorie
B) Degree
C) Joule
D) Newton
✔ Correct Answer: C) Joule
Which group is known as alkali metals?
A) Group 2
B) Group 1
C) Group 13
D) Group 17
✔ Correct Answer: B) Group 1
Who developed the periodic table?
A) Dalton
B) Mendeleev
C) Thomson
D) Rutherford
✔ Correct Answer: B) Mendeleev
Group 14 and Group 16 elements are classified as:
A) Halogens & Inert gases
B) Alkali & Alkaline
C) Carbon & Oxygen families
D) Transition metals
✔ Correct Answer: C) Carbon & Oxygen families
General formula of organic compounds:
A) R–OH
B) Cโ‚™H₂โ‚™₊₂ (alkanes)
C) H₂O
D) NaCl
✔ Correct Answer: B) Cโ‚™H₂โ‚™₊₂ (alkanes)
H₂O is:
A) Element
B) Ion
C) Compound
D) Radical
✔ Correct Answer: C) Compound
Stoichiometry is the branch of chemistry that deals with:
A) pH measurement
B) Quantitative relationships in reaction
C) Acid-base behavior
D) Organic naming
✔ Correct Answer: B) Quantitative relationships in reaction
NaCl is a:
A) Mixture
B) Element
C) Compound
D) Radical
✔ Correct Answer: C) Compound
Green Chemistry refers to:
A) Use of radioactive materials
B) Fast reactions
C) Designing processes to reduce hazardous substances
D) Burning of fuels
✔ Correct Answer: C) Designing processes to reduce hazardous substances
Isotopes are atoms having:
A) Different atomic numbers
B) Same atomic number, different mass numbers
C) Same mass and charge
D) Different charges
✔ Correct Answer: B) Same atomic number, different mass numbers
Radius of hydrogen's first orbit is:
A) 0.0529 nm
B) 0.529 ร…
C) 1.67 × 10⁻²⁷ m
D) 1.529 nm
✔ Correct Answer: B) 0.529 ร…
Boiling an egg is what type of change?
A) Physical
B) Chemical
C) Nuclear
D) None
✔ Correct Answer: B) Chemical
Heating soup in microwave is:
A) Physical
B) Chemical
C) Irreversible
D) None
✔ Correct Answer: A) Physical
Chemical formula of Hexane:
A) C₂H₆
B) C₄H₁₀
C) C₆H₁₄
D) C₃H₇
✔ Correct Answer: C) C₆H₁₄
Common name of NaOH:
A) Baking soda
B) Caustic soda
C) Washing soda
D) Bleaching powder
✔ Correct Answer: B) Caustic soda
Shape of R-NH₂ (Primary Amine):
A) Linear
B) Bent
C) Pyramidal
D) Octahedral
✔ Correct Answer: C) Pyramidal
Boyle's Law refers to:
A) P ∝ T
B) V ∝ T
C) PV = constant
D) P ∝ n
✔ Correct Answer: C) PV = constant
General formula of alcohols:
A) CnH₂n₊₁OH
B) CnH₂nOH
C) CnH₂n-OH
D) CH₄O
✔ Correct Answer: A) CnH₂n₊₁OH
Sodium reacts with phenol to give:
A) H₂
B) CO₂
C) CO
D) Benzene
✔ Correct Answer: A) H₂
Which of the following represent isotopes?
A) Same atomic no, different mass
B) Same mass, different atomic no
C) Same protons, neutrons
D) All same
✔ Correct Answer: A) Same atomic no, different mass
Endothermic process example:
A) Condensation
B) Freezing
C) Photosynthesis
D) Combustion
✔ Correct Answer: C) Photosynthesis
Exothermic process example:
A) Melting of ice
B) Burning of wood
C) Evaporation
D) Boiling
✔ Correct Answer: B) Burning of wood
Physical change example:
A) Melting of ice
B) Rusting of iron
C) Burning of paper
D) Baking a cake
✔ Correct Answer: A) Melting of ice
Chemical change example:
A) Boiling water
B) Breaking glass
C) Rusting of iron
D) Cutting paper
✔ Correct Answer: C) Rusting of iron
What is the rate of a chemical reaction?
A) The time taken for the reaction to complete
B) The change in concentration of reactants or products per unit time
C) The total energy released during the reaction
D) The temperature at which the reaction occurs
✔ Correct Answer: B) The change in concentration of reactants or products per unit time
For a first-order reaction, the rate constant has units of:
A) s⁻¹
B) mol/L·s
C) mol/L
D) mol·L·s
✔ Correct Answer: A) s⁻¹
Which of the following is true for a zero-order reaction?
A) Rate = k[A]
B) Rate = k[A]²
C) Rate = k
D) Rate = k[A]โฟ
✔ Correct Answer: C) Rate = k
Which factor does NOT affect the rate of a chemical reaction?
A) Temperature
B) Concentration of reactants
C) Presence of a catalyst
D) Volume of the reaction vessel
✔ Correct Answer: D) Volume of the reaction vessel
Increasing the temperature generally:
A) Decreases the rate of reaction
B) Increases the rate of reaction
C) Has no effect on the rate
D) Stops the reaction
✔ Correct Answer: B) Increases the rate of reaction
The presence of a catalyst:
A) Increases the activation energy
B) Decreases the activation energy
C) Has no effect on the activation energy
D) Consumes itself in the reaction
✔ Correct Answer: B) Decreases the activation energy
In a gaseous reaction, increasing the pressure:
A) Decreases the rate of reaction
B) Increases the rate of reaction
C) Has no effect on the rate
D) Stops the reaction
✔ Correct Answer: B) Increases the rate of reaction
Water (H₂O) is a:
A) Mixture
B) Element
C) Compound
D) Radical
✔ Correct Answer: C) Compound
Formula of Potassium Nitrate is:
A) NaNO₃
B) NO₃⁻
C) KNO₃
✔ Correct Answer: C) KNO₃
Exothermic reactions are characterized by:
A) Absorption of heat
B) Release of heat
C) No energy change
✔ Correct Answer: B) Release of heat
Enthalpy of an endothermic reaction is:
A) Negative
B) Positive
C) Zero
✔ Correct Answer: B) Positive
The positive electrode is called:
A) Anion
B) Anode
C) Cathode
✔ Correct Answer: B) Anode
The atomic number of oxygen is:
A) 6
B) 8
C) 10
D) 12
✔ Correct Answer: B) 8
The gas produced when calcium carbonate reacts with hydrochloric acid is:
A) Oxygen
B) Hydrogen
C) Carbon dioxide
D) Nitrogen
✔ Correct Answer: C) Carbon dioxide
Which phenol is treated with concentrated nitric acid gives:
(a) Meta nitro phenol
(b) Ortho / Para nitro phenol
(c) Picric acid
(d) none of these
✔ Correct Answer: (c) Picric acid
Phenol is used in the manufacture of:
(a) Plastics
(b) Soap
(c) Ointments
(d) All of these
✔ Correct Answer: (d) All of these
______ is used as ink preservative:
(a) Methanol
(b) Ethanol
(c) Phenol
(d) Picric acid
✔ Correct Answer: (c) Phenol
The compound in which an oxygen atom is bonded with two alkyl radicals is called:
(a) Ether
(b) Ester
(c) Alcohol
(d) Aldehydes
✔ Correct Answer: (a) Ether
Which of the following may be considered as anhydride of alcohols?
(a) Aldehydes
(b) Ester
(c) Ether
(d) Ketones
✔ Correct Answer: (c) Ether
Ether is called symmetrical if it contains:
(a) Linear alkyl radicals
(b) Small alkyl radicals
(c) Branched alkyl radicals
(d) similar alkyl radicals
✔ Correct Answer: (d) similar alkyl radicals
When sodium ethoxide is treated with ethyl bromide it gives:
(a) Butane
(b) Ethoxy ethane
(c) Propane & methyl bromide
(d) none of these
✔ Correct Answer: (b) Ethoxy ethane
In Williamson synthesis diethyl ether is produced from:
(a) Ethanol
(b) Ethyl chloride
(c) Calcium formate
(d) Ethylene glycol
✔ Correct Answer: (a) Ethanol
Which of the following has the lowest boiling point?
(a) Ethoxy ethane
(b) Methanol
(c) Ethanol
(d) Acetic acid
✔ Correct Answer: (a) Ethoxy ethane
Which of the following is true for an Oxonium ion?
(a) Oxygen is bonded with three atoms
(b) Oxygen carries positive charge
(c) It is poly atomic ion
(d) All of these
✔ Correct Answer: (d) All of these
The carbohydrates consisting of a very large number of monosaccharide units condensed into straight and branched chain molecules with the general formula (CnH2nOn) are called .
a) Polysaccharides
b) Multisaccharides
c) Decasaccharides
d) Oligosaccharides
✔ Correct Answer: a) Polysaccharides
Oligosaccharides are also called .
a) Vitamins
b) Sugars
c) Minerals
d) Fats
✔ Correct Answer: b) Sugars
Sucrose is hydrolyzed to give a molecule each of glucose and ......
a) Glucose
b) Ribose
c) Glycerose
d) Galactose
✔ Correct Answer: d) Galactose
The carbohydrates consisting of a very large number of monosaccharide units condensed into straight and branched chain molecules with the general formula (CnH2nOn) are called ......
a) Monosaccharides
b) Polysaccharides
c) Oligosaccharides
d) Decasaccharides
✔ Correct Answer: b) Polysaccharides
The general formula of alkanes is:
A) CnH2n+2
B) CnH2n
C) CnH2n−2
D) CnHn
✔ Correct Answer: A) CnH2n+2
Which hydrocarbon contains a triple bond?
A) Alkane
B) Alkene
C) Alkyne
D) Cycloalkane
✔ Correct Answer: C) Alkyne
A monoprotic acid is one that can donate:
A) One proton per molecule
B) Two protons per molecule
C) Three protons per molecule
D) No protons
✔ Correct Answer: A) One proton per molecule
Which of the following is a monoprotic acid?
A) H₂SO₄
B) H₃PO₄
C) HCl
D) H₂CO₃
✔ Correct Answer: C) HCl
A diprotic acid can donate:
A) One proton per molecule
B) Two protons per molecule
C) Three protons per molecule
D) Four protons per molecule
✔ Correct Answer: B) Two protons per molecule
Which of the following is a diprotic acid?
A) HNO₃
B) CH₃COOH
C) H₂SO₄
D) H₃PO₄
✔ Correct Answer: C) H₂SO₄
The number of ionizable hydrogen atoms in a monoprotic acid is:
A) 0
B) 1
C) 2
D) 3
✔ Correct Answer: B) 1
The number of ionizable hydrogen atoms in a diprotic acid is:
A) 0
B) 1
C) 2
D) 3
✔ Correct Answer: C) 2
Which of the following is NOT a monoprotic acid?
A) HBr
B) HI
C) H₂SO₄
D) HNO₃
✔ Correct Answer: C) H₂SO₄
Which of the following is NOT a diprotic acid?
A) H₂CO₃
B) H₂C₂O₄
C) H₂S
D) CH₃COOH
✔ Correct Answer: D) CH₃COOH
Carbonic acid (H₂CO₃) is an example of:
A) Monoprotic acid
B) Diprotic acid
C) Triprotic acid
D) None of these
✔ Correct Answer: B) Diprotic acid
Hydrochloric acid (HCl) is classified as:
A) Diprotic acid
B) Triprotic acid
C) Monoprotic acid
D) Polyprotic acid
✔ Correct Answer: C) Monoprotic acid
Sulfuric acid (H₂SO₄) dissociates in water to give:
A) One H⁺ ion
B) Two H⁺ ions
C) Three H⁺ ions
D) No H⁺ ions
✔ Correct Answer: B) Two H⁺ ions
Which of the following is a triprotic acid?
A) HCl
B) H₂SO₄
C) H₃PO₄
D) HNO₃
✔ Correct Answer: C) H₃PO₄
The first dissociation constant (Ka₁) of a diprotic acid is generally:
A) Equal to Ka₂
B) Smaller than Ka₂
C) Larger than Ka₂
D) Zero
✔ Correct Answer: C) Larger than Ka₂
Oxalic acid (H₂C₂O₄) is an example of:
A) Monoprotic acid
B) Diprotic acid
C) Triprotic acid
D) None of these
✔ Correct Answer: B) Diprotic acid
Acetic acid (CH₃COOH) is a:
A) Strong monoprotic acid
B) Weak monoprotic acid
C) Strong diprotic acid
D) Weak diprotic acid
✔ Correct Answer: B) Weak monoprotic acid
The neutralization of a diprotic acid with a base requires:
A) One mole of base per mole of acid
B) Two moles of base per mole of acid
C) Three moles of base per mole of acid
D) No base
✔ Correct Answer: B) Two moles of base per mole of acid
The neutralization of a monoprotic acid with a base requires:
A) One mole of base per mole of acid
B) Two moles of base per mole of acid
C) Three moles of base per mole of acid
D) Four moles of base per mole of acid
✔ Correct Answer: A) One mole of base per mole of acid
Which of the following acids is diprotic?
A) Nitric acid
B) Phosphoric acid
C) Sulfurous acid (H₂SO₃)
D) Hydrofluoric acid
✔ Correct Answer: C) Sulfurous acid (H₂SO₃)
The conjugate base of a monoprotic acid after losing one H⁺ is:
A) Neutral
B) Positively charged
C) Negatively charged
D) Unchanged
✔ Correct Answer: C) Negatively charged
The intermediate ion formed when a diprotic acid loses one H⁺ is called:
A) Hydronium ion
B) Hydrogen carbonate ion (for H₂CO₃)
C) Hydroxide ion
D) Oxide ion
✔ Correct Answer: B) Hydrogen carbonate ion (for H₂CO₃)
The hybridization of carbon in methane is:
A) sp
B) sp²
C) sp³
D) dsp²
✔ Correct Answer: C) sp³
Ethene belongs to which homologous series?
A) Alkane
B) Alkene
C) Alkyne
D) Aromatic hydrocarbon
✔ Correct Answer: B) Alkene
The molecular formula of propane is:
A) C₂H₄
B) C₃H₈
C) C₄H₁₀
D) C₃H₆
✔ Correct Answer: B) C₃H₈
The homologous series of benzene is called:
A) Alicyclic
B) Aromatic
C) Alkynes
D) Alkenes
✔ Correct Answer: B) Aromatic
Complete combustion of hydrocarbons produces:
A) CO₂ and H₂O
B) CO and H₂
C) Carbon and water
D) Alcohol and CO₂
✔ Correct Answer: A) CO₂ and H₂O
The IUPAC name of C₂H₂ is:
A) Ethane
B) Ethene
C) Ethyne
D) Ethanol
✔ Correct Answer: C) Ethyne
Which hydrocarbon has only single covalent bonds?
A) Ethene
B) Ethyne
C) Benzene
D) Butane
✔ Correct Answer: D) Butane
The functional group present in alkenes is:
A) C–C
B) C=C
C) C≡C
D) –OH
✔ Correct Answer: B) C=C
Which hydrocarbon is aromatic?
A) Ethane
B) Propene
C) Benzene
D) Butyne
✔ Correct Answer: C) Benzene
The suffix "-yne" represents:
A) Single bond
B) Double bond
C) Triple bond
D) Aromatic ring
✔ Correct Answer: C) Triple bond
The IUPAC name of CH₄ is:
A) Methene
B) Methane
C) Methyne
D) Methyl
✔ Correct Answer: B) Methane
Which compound undergoes addition reaction most readily?
A) Methane
B) Ethane
C) Ethene
D) Cyclohexane
✔ Correct Answer: C) Ethene
The configuration of Na is:
A) [He]2s²2p⁶3s¹
B) [Ne]3s¹
C) [Ar]3s¹
D) [He]3s¹
✔ Correct Answer: B) [Ne]3s¹
The configuration [Ar]4s² corresponds to:
A) Ca
B) K
C) Sc
D) Mg
✔ Correct Answer: A) Ca
The number of sigma bonds in ethyne (C₂H₂) is:
A) 2
B) 3
C) 4
D) 5
✔ Correct Answer: B) 3
The structural formula of ethene is:
A) CH₃–CH₃
B) CH₂=CH₂
C) CH≡CH
D) CH₃–CH₂–CH₃
✔ Correct Answer: B) CH₂=CH₂
Which hydrocarbon decolorizes bromine water?
A) Methane
B) Ethane
C) Ethene
D) Benzene
✔ Correct Answer: C) Ethene
Which element has configuration [Ne]3s²3p¹?
A) Al
B) Si
C) P
D) Mg
✔ Correct Answer: A) Al
The main constituent of natural gas is:
A) Ethane
B) Propane
C) Methane
D) Butane
✔ Correct Answer: C) Methane
Benzene contains how many ฯ€ bonds?
A) 1
B) 2
C) 3
D) 6
✔ Correct Answer: C) 3
The formula of butyne is:
A) C₄H₁₀
B) C₄H₈
C) C₄H₆
D) C₄H₄
✔ Correct Answer: C) C₄H₆
Which reaction is characteristic of alkanes?
A) Addition
B) Substitution
C) Polymerization
D) Hydration
✔ Correct Answer: B) Substitution
The geometry around carbon in ethene is:
A) Tetrahedral
B) Linear
C) Trigonal planar
D) Octahedral
✔ Correct Answer: C) Trigonal planar
Which compound is unsaturated?
A) Ethane
B) Propane
C) Butene
D) Cyclohexane
✔ Correct Answer: C) Butene
The first member of alkynes is:
A) Ethyne
B) Methyne
C) Propyne
D) Butyne
✔ Correct Answer: A) Ethyne
The chemical formula of benzene is:
A) C₆H₆
B) C₆H₁₂
C) C₆H₁₄
D) C₇H₈
✔ Correct Answer: A) C₆H₆
Cracking of hydrocarbons produces:
A) Smaller hydrocarbons
B) Alcohols
C) Salts
D) Esters
✔ Correct Answer: A) Smaller hydrocarbons
Which of the following is a saturated hydrocarbon?
A) Ethene
B) Ethyne
C) Propane
D) Benzene
✔ Correct Answer: C) Propane
The bond angle in methane is approximately:
A) 90°
B) 109.5°
C) 120°
D) 180°
✔ Correct Answer: B) 109.5°
The reagent used to test unsaturation is:
A) NaOH
B) HCl
C) Bromine water
D) NaCl
✔ Correct Answer: C) Bromine water
Which compound has sp hybridized carbon atoms?
A) Ethane
B) Ethene
C) Ethyne
D) Benzene
✔ Correct Answer: C) Ethyne
Starch and cellulose are ...... in taste
a) Sweet
b) Sour
c) Tasteless
d) Salty
✔ Correct Answer: c) Tasteless
Human and many other animals cannot digest and use ...... as a food
a) Glucose
b) Fructose
c) Starch
d) Cellulose
✔ Correct Answer: d) Cellulose
The rate of a reaction is directly proportional to the square root of the concentration of ______.
a) Coenzyme
b) Enzyme
c) Substrate
d) Reactants
✔ Correct Answer: c) Substrate
Majority of enzymes have an optimum temperature of:
a) 37–50°C
b) 55°C
c) 60°C
d) 25°C
✔ Correct Answer: a) 37–50°C
Nitrogen gas is passed through oil at higher temperature and in the presence of ...... as catalyst.
a) Cu
b) Pt
c) Pd
✔ Correct Answer: a) Cu
Milk, fat, butter, cream and fish liver oil contain vitamin ......
a) B and D
b) E and K
c) B and C
d) A and D
✔ Correct Answer: d) A and D
The development of unpleasant smell in a fat or oil is called ......
a) Rancidity
b) Saponification
c) Fermentation
d) Hardening
✔ Correct Answer: a) Rancidity
When hydroxyl group is bonded with the carbon atom of an aliphatic chain, the compound is called
(a) Alcohol
(b) Phenol
(c) Aldehydes
(d) Glycol
✔ Correct Answer: (a) Alcohol
When – OH group is bonded with the carbon atom of an aromatic chain the compound is called
(a) Alcohol
(b) Phenol
(c) Aldehydes
(d) Glycol
✔ Correct Answer: (b) Phenol
Ethylene glycol is an example of ______ alcohol
(a) Monohydric
(b) Dihydric
(c) Trihydric
(d) Polyhydric
✔ Correct Answer: (b) Dihydric
Which of the following is the tertiary alcohol?
(a) Iso butyl alcohol
(b) Neo pentyl alcohol
(c) 2 – Methyl – 2 – Propanol
(d) All of these
✔ Correct Answer: (c) 2 – Methyl – 2 – Propanol
Which of the following is called wood spirit?
(a) Methanol
(b) Ethanol
(c) Formic acid
(d) Formaldehyde
✔ Correct Answer: (a) Methanol
When water gas is heated in presence of ZnO / Cr₂O₃ it gives
(a) Carboxylic acid
(b) Formaldehyde
(c) Methanol
(d) Ethanol
✔ Correct Answer: (c) Methanol
The boiling point of methanol is
(a) 64.7 °C
(b) 78.5 °C
(c) 100 °C
(d) 110 °C
✔ Correct Answer: (a) 64.7 °C
Which of the following is more toxic and poisonous?
(a) Methanol
(b) Ethanol
(c) Formic acid
(d) Formaldehyde
✔ Correct Answer: (a) Methanol
Methanol on oxidation gives
(a) Methanal
(b) CO₂
(c) Water gas
(d) All of these
✔ Correct Answer: (a) Methanal
The hydrolysis of a fat or oil with an alkali to form soap and glycerol is called:
a) Rancidity
b) Saponification
c) Hydrogenation
d) Hardening
✔ Correct Answer: b) Saponification
The complex organic compounds which act as catalyst and facilitate the normal growth of the body are called:
a) Proteins
b) Alkaloids
c) Steroids
d) Vitamins
✔ Correct Answer: d) Vitamins
The first discovered vitamin was:
a) Niacin
b) Biotic
c) Thiamine
d) Ascorbic acid
✔ Correct Answer: c) Thiamine
Thiamine vitamin cure the disease:
a) Beri beri
b) Cholera
c) Fever
d) Headache
✔ Correct Answer: a) Beri beri
So far ...... vitamins have been discovered:
a) 11
b) 13
c) 15
d) 9
✔ Correct Answer: b) 13
The common salt used in our daily life is:
A) Sodium carbonate
B) Sodium hydroxide
C) Sodium chloride
D) Sodium sulphate
✔ Correct Answer: C) Sodium chloride
One would like to install the bleaching powder manufacturing industry where ___:
A) Mg salts are available
B) Ca salts are available
C) Na salts are available
D) Silica is available
✔ Correct Answer: B) Ca salts are available
For the installation of industry (factory) the first thing to bear in mind is ___:
A) Availability of raw material
B) Man power
C) Transportation
D) Cost of fuel
✔ Correct Answer: A) Availability of raw material
The commercial name of CaO is:
A) Lime
B) Gypsum
C) Marble
D) Limestone
✔ Correct Answer: A) Lime
Common dehydrating agent used in laboratory is:
A) MgCO3
B) CaCl2
C) MgF2
D) CaF2
✔ Correct Answer: B) CaCl2
A method used for the preparation of sodium metal is named after the scientist who devised it. Who is he?
A) Curtius
B) Down
C) Schmidt
D) Haber
✔ Correct Answer: B) Down
Which element does not belong to alkaline earth metals:
A) Mg
B) Sr
C) Ca
D) Rb
✔ Correct Answer: D) Rb
Francium is the most electropositive element in its family due to the fact that ___:
A) Its incomplete shell is nearest to the nucleus
B) Valence electrons have a larger orbital than valence electrons of other elements
C) It is heavier element
D) It exerts more attractive force on valence electron
✔ Correct Answer: B) Valence electrons have a larger orbital than valence electrons of other elements
LiCl is more soluble in organic solvents than NaCl because:
A) Li+ has higher heat of hydration than Na+
B) Li+ has lower heat of hydration than Na+
C) LiCl is more covalent than NaCl
D) Lattice energy of NaCl is less than that of LiCl
✔ Correct Answer: C) LiCl is more covalent than NaCl
The brown gas is formed when metals reduce HNO₃ is:
A) NO₂
B) N₂O₅
C) N₂O₄
D) N₂O
✔ Correct Answer: A) NO₂
In the Ostwald's process which substance is used to oxidize NH₃?
A) O₂
B) NO₂
C) PtO₄
D) Pt/Rh
✔ Correct Answer: D) Pt/Rh
Which of the following is paramagnetic?
A) NH₂OH
B) NO₂
C) N₂O
D) N₂H₄Cl₂
✔ Correct Answer: B) NO₂
Which one of the following element does not show allotropy?
A) Sb
B) Bi
C) As
D) P
✔ Correct Answer: B) Bi
The large deposits of sulphur in nature are found as:
A) Sulphurous acid
B) Sulphuric acid
C) Free sulphur
D) Hydro sulphuric acid
✔ Correct Answer: C) Free sulphur
Sulphur burns in the air to produce:
A) SO₂
B) S₂O₃
C) H₂S
D) SO₃
✔ Correct Answer: A) SO₂
What is the color of bleaching powder?
A) Blue
B) Yellowish white
C) Green
D) Red
✔ Correct Answer: B) Yellowish white
Calcium sulphate is found both in the hydrated and anhydrous states, in the hydrated state it is more common and is called:
A) Gypsum
B) Sodium
C) Barium
D) Beryllium
✔ Correct Answer: A) Gypsum
Gypsum becomes anhydrous at:
A) 300°C
B) 200°C
C) 150°C
D) 95°C
✔ Correct Answer: B) 200°C
Plaster of Paris is a ___ calcium sulphate:
A) Hemihydrate
B) Dihydrate
C) Anhydrite
D) None of the above
✔ Correct Answer: A) Hemihydrate
Plaster of Paris is obtained from:
A) Epsom
B) Gypsum
C) Sodium
D) All of the above
✔ Correct Answer: B) Gypsum
Each molecule of plaster of Paris contains:
A) Two water molecules
B) One water molecule
C) Half water molecules
D) Three water molecules
✔ Correct Answer: C) Half water molecules
Hydrated calcium sulphate is commonly known as:
A) Gypsum
B) Epsom
C) Sodium
D) Lithium
✔ Correct Answer: A) Gypsum
Anhydrous sodium carbonate is also called:
A) Soda ash
B) Cake salt
C) Baking soda
D) Caustic soda
✔ Correct Answer: A) Soda ash
Which of the following is the most powerful oxidizing agent?
A) Cl₂
B) Br₂
C) F₂
D) I₂
✔ Correct Answer: C) F₂
At ordinary temperature sodium reacts with air or oxygen to form:
A) Sodium oxide
B) Sodium peroxide
C) Sodium sulphide
D) None of the above
✔ Correct Answer: B) Sodium peroxide
Sodium acts as:
A) Strong reduction agent
B) Weak reducing agent
C) Ordinary reducing agent
D) None of the above
✔ Correct Answer: A) Strong reduction agent
The increased quantity of ...... in blood make plague like deposits in the arteries causing blood pressure and heart diseases.
a) Urea
b) Water
c) Glucose
d) Cholesterol
✔ Correct Answer: d) Cholesterol
Triglycerides are the esters of fatty acids and ......
a) Methanol
b) Ethanol
c) Glycerol
d) Glycol
✔ Correct Answer: c) Glycerol
The fatty acids, having alkyl groups containing C—C single bonds are called ...... fatty acids.
a) Unsaturated
b) Saturated
c) Basic
d) Neutral
✔ Correct Answer: b) Saturated
Alkyl groups of unsaturated fatty acids contains at least one carbon – carbon ......
a) Double bond
b) Single bond
c) Covalent bond
d) Ionic bond
✔ Correct Answer: a) Double bond
Iodine number in the number of grams of iodine consumed by ...... grams of fat or oil.
a) 1
b) 1000
c) 10
d) 100
✔ Correct Answer: d) 100
The addition of hydrogen to unsaturated vegetable oils to convert them into the solid state is called:
a) Hydrogenation
b) Softening
c) Liquefaction
d) Solidification
✔ Correct Answer: a) Hydrogenation
Hydrogen gas is passed through oil at higher temperature and in the presence of ...... as catalyst.
a) Cu
b) Ni
c) Pt
d) Pd
✔ Correct Answer: b) Ni
Matter having no definite shape and volume is called:
A) Liquid
B) Solid
C) Gas
D) None of these
✔ Correct Answer: C) Gas
Gases possess:
A) Indefinite volume
B) Indefinite shape
C) All the three
D) None of these
✔ Correct Answer: C) All the three
The force exerted by 76 cm long column of Hg on an area of 1 cm² at 0°C is called:
A) Pascal pressure
B) Standard pressure
C) Normal scale
D) Barometer
✔ Correct Answer: B) Standard pressure
Atmospheric pressure is measured by:
A) Manometer
B) Thermometer
C) Barometer
D) Ammeter
✔ Correct Answer: C) Barometer
The scale in which freezing point of water is taken as 32° and boiling point of water as 212° is called:
A) Fahrenheit scale
B) Celsius scale
C) Kelvin scale
D) Rankine scale
✔ Correct Answer: A) Fahrenheit scale
One atmosphere is equal to:
A) 760 torr
B) 760 mm Hg
C) 760 atm
D) 760 kPa
✔ Correct Answer: A) 760 torr and B) 760 mm Hg (Both are correct)
At constant temperature, volume of given mass of a gas is inversely proportional to pressure on it. This is a statement of:
A) Charles' law
B) Boyle's law
C) Gay-Lussac's law
D) Dalton's law
✔ Correct Answer: B) Boyle's law
The volume of a fixed mass of a gas is directly proportional to the absolute temperature, at constant pressure. This is a statement of:
A) Boyle's law
B) Charles' law
C) Gay-Lussac's law
D) Dalton's law
✔ Correct Answer: B) Charles' law