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General Science question from Laboratory Attendant exam, 2026 by JKSSB

Which gas is produced when water reacts with calcium?  

Last updated Sep 16, 2026
Correct Answer: Option A — Hydrogen
When calcium metal reacts with water, it undergoes a chemical reaction to produce calcium hydroxide and hydrogen gas.

The reaction is moderately exothermic (releases heat), causing the hydrogen gas bubbles to stick to the surface of the calcium metal. Because of these trapped gas bubbles, the calcium metal actually begins to float on the water's surface.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.
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JKSSB Laboratory Attendant 2026

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Exam JKSSB
Recruitment Laboratory Attendant
Year 2026
Subject General Science
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