NCERT Class 10 Chapter 1 Chemical Reaction and Equation CBSE Board Sample Problems Multiple Choice Question

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In which of the following, heat energy will be evolved?

i) Electrolysis of water

ii) Dissolution of ammonium chloride in water

iii) Burning of L.P.G.

iv) Decomposition of silver bromide in the presence of sunlight


Dilute Hydrochloric acid is added to granulated zinc taken in a test tube.

The following observations are recorded. Point out the correct observation

i) The surface of metal becomes shining

ii) The reaction mixture turns milky

iii) Odour of a pungent smelling gas is recorded

iv) A colourless and odourless gas ¡s evolved


Which information is not conveyed by a balanced chemical equation?

i) Physical states of reactants and products

ii) Symbols and formulas of all the substances involved in a particular reaction

iii) Number of atoms/molecules of the reactants and products formed

iv) Whether a particular reaction is actually feasible or not


The chemical reaction between quick lime and water is characterized by:

a) Evolution of hydrogen gas

b) Formation of slaked lime

c) Change in colour of product

d) Change in temperature of mixture


Which of the following gases can be used to store fresh sample of oil for long time:



iii) or He

iv) He or


Which of following are exothermic processes

i) Reaction of water with quick lime

ii) Evaporation of water

iii) Dilution of an acid

iv) Sublimation of camphor

a) i and ii

b) ii and iii

b) i and iv

c) iii and iv


In double displacement reaction between aqueous potassium iodide and aqueous Lead nitrate, a yellow precipitate of lead iodide is formed. While performing activity, If lead nitrate is nor available which one of following can be used:

i) Lead Sulphate

ii) Lead Acetate

iii) Ammonium acetate

iv) Potassium Sulphate


For the given question two statements are given one labeled Assertion (A) and the other labeled

Reason (R). Select the correct answer to these question from codes (i), (ii), (iii) and (iv) as given below:

Assertion (A): In a reaction of copper oxide with hydrogen, hydrogen serves as reducing agent.

Reason (R): A substance that gains oxygen in a chemical reaction is a reducing agent.

a) Both A and R are true and R ¡s correct explanation of the assertion.

b) Both A and R are true but R is not the correct explanation of the assertion.

c) A is true but R is false.

d) A is false but R is true.


The above equation is an example of:

a) Combination reaction

b) Displacement reaction

c) Precipitation reaction

d) Double Displacement reaction


Anu heated some lead nitrate crystals in a boiling tube. She recorded the evolution of:

a) Colourless gas

b) Odourless gas

c) Brown gas

d) Violet gas


The chemical reaction between Calcium oxide and water is:

a) Endothermic reaction

b) Decomposition reaction

c) Exothermic reaction

d) Displacement reaction


A student took some zinc granules a test tube and added dilute hydrochloric acid to it. A colourless, odourless gas X was evolved .The gas X is:

a) Hydrogen

b) Oxygen

c) Carbon dioxide

d) Nitrogen dioxide


Silver chloride turns grey on exposure to sunlight for a long duration due to:

a) The formation of silver by decomposition of silver chloride

b) Formation of chlorine gas from silver chloride.

c) Sublimation of silver chloride

d) Oxidation of silver chloride


What is the chemical name for rust?

a) Ferric sulphate

b) Ferric oxide

c) Hydrated ferric oxide

d) Ferric chloride