The World of Metals and Non metals Class 7 Assertion and Reason Questions

The World of Metals and Non metals Class 7 Assertion and Reason Questions

The World of Metals and Non metals Class 7 Assertion and Reason Questions

Following questions are of Assertion (A), Reason (R) type questions. Choose the correct answer from the following options.

(a) Both A and R are true, and R is the correct explanation of A.

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

(c) A is true, but R is false.

(d) A is false, but R is true.

1. (A): Aluminium is commonly used to make food packaging materials.

(R): Aluminium is cheaper and can be easily shaped into thin sheets.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

2. (A): Sodium metal catches fire when it comes in contact with water.

(R): Sodium reacts vigorously with water, producing hydrogen gas.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

3. (A): Metals are generally good conductors of heat and electricity.

(R): Metals have free electrons that facilitate the transfer of heat and electric current.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

4. (A): Copper vessels are often used for boiling water.

(R): Copper is a poor conductor of heat compared to other metals.

Answer:

(c) A is true, but R is false.

5. (A): Iron rusts when exposed to moisture and air.

(R): Rusting is a chemical reaction that occurs only in the presence of sulfur.

Answer:

(c) A is true, but R is false.