Chemical Reactions : Class 9 Science MCQ Practice Questions & Answers (Bengali)

1.

What does the law of conservation of mass state?

A

Mass is gained during a chemical reaction

B

Mass remains constant during a chemical reaction

C

Mass can be created in a chemical reaction

D

Mass is lost during a chemical reaction

2.

Which of the following is a property of a chemical reaction?

A

It always requires heat

B

It results in the formation of new substances

C

It only occurs in solids

D

It only occurs in gases

3.

Which of the following is not an example of a chemical reaction?

A

Dissolving salt in water

B

Burning of wood

C

Rusting of iron

D

Digestion of food

Chemical Reactions in Class 9 Science : Practice MCQ Questions & Answers with Explanations