Question

Assertion (A): 2 g of hydrogen combines with 16 g of oxygen to form 18 g of water.

Reason (R): According to Dalton’s Atomic Theory, atoms combine in a simple whole number ratio by mass to form compounds.

Choose the correct option:

Options

• Both A and R are true, and R is the correct explanation of A.

• Both A and R are true, but R is not the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.

Answer 1

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

Explanation:

The assertion is true because hydrogen and oxygen combine in the fixed mass ratio 1:8, so 2 g of hydrogen and 16 g of oxygen form 18 g of water without loss of mass. The reason is also true: Dalton’s theory states that atoms combine in fixed whole-number ratios, thereby explaining the formation of water in this definite proportion.