CBSE Class 10 Chemistry Chemical Reaction and Equations Worksheet Set B

Question. 10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. 
If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be
a) 4 mL
b) 8 mL
c) 12 mL
d) 16 mL

Answer : D

Question. Which one of the following types of medicines is used for treating indigestion ? 
a) antibiotic
b) analgesic
c) antacid
d) antiseptic

Answer : C

Question. A solution turns red litmus blue, its pH is likely to be 
a) 1
b) 4
c) 5
d) 10

Answer : D

Question. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains 
a) NaCl
b) HCl
c) LiCl
d) KCl

Answer : B

Chemical Reactions and Equations Assertion Reason Class 10 Science

A. Both assertionand reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion(A): Iron nails turn blue colour copper sulphate solution to green colour.
Reason(R): Copper is more reactive than iron.

Answer: C

Question. Assertion(A): Decomposition of Calcium Carbonate is a type of chemical reaction.
Reason(R): Chemical reactions involve the breaking and making of bonds to produce new substances.

Answer: A

Question. Assertion(A): Oxidation and reduction take place simultaneously in a reaction.
Reason(R): All chemical reactions are redox reactions.

Answer: C

Question. Assertion(A): The number of atoms of each element remains the same, before and after a chemical reaction.
Reason(R): Any chemical equation can be unbalanced because the mass may not be same on both sides of the equation.

Answer: C

Question. Assertion(A): Silver Chloride turns grey in sunlight.
Reason(R): This is an example of thermal decomposition.

Answer: C

Question. Assertion(A): The colour of salts does not depend on water of crystallisation.
Reason(R): Ferrous Sulphate crystals are blue in colour because of the seven water molecules of crystallisation.

Answer: D

Question. Assertion(A): Addition of oxygen is oxidation.
Reason(R): Removal of oxygen is reduction.

Answer: B

Question. Assertion(A): Reaction between Barium Hydroxide and Ammonium Chloride makes the test tube cool to touch.
Reason(R): It is an example of endothermic reaction.

Answer: A

Question. Assertion(A): Fatty foods taste the same even after long periods of exposure to air.
Reason(R): We should store oily foods in air tight containers.

Answer: D