Question

The correct statements among the following are: 

i. Saline hydrides produce \( \text{H}_2 \) gas when reacted with water. 
ii. Presently ~77% of the industrial dihydrogen is produced from coal. 
iii. Commercially marketed \( \text{H}_2 \text{O}_2 \) contains 3% \( \text{H}_2 \text{O}_2 \).

• A. i, ii, iii
• B. i, iii only
• C. ii, iii only
• D. i, ii only

Hint:

For industrial hydrogen production, natural gas is more commonly used than coal due to its efficiency and cost-effectiveness.

Answer 1

The Correct Option is B

Step 1: Statement (i) is true because saline hydrides like NaH react with water to produce hydrogen gas (\( \text{H}_2 \)).
Step 2: Statement (ii) is false because most industrial hydrogen is produced from natural gas, not coal.
Step 3: Statement (iii) is true because commercially available \( \text{H}_2 \text{O}_2 \) typically contains 3% hydrogen peroxide. Thus, the correct answer is (B) i, iii only.