Question

When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is:

• A. 1:1
• B. 1:2
• C. 2:1
• D. 9:4

Hint:

The amount of hydrogen gas produced in reactions with zinc is proportional to the amount of zinc reacted.

Answer 1

The Correct Option is A

Step 1: Analyze the reactions.
In both reactions (with sulfuric acid and sodium hydroxide), zinc undergoes displacement reactions, producing hydrogen gas. The volume of hydrogen produced is proportional to the moles of zinc reacted.
Step 2: Conclusion.
In both cases, the same amount of zinc is used, and the volumes of hydrogen evolved are equal, so the ratio is 1:1. Final Answer: \[ \boxed{1:1} \]