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NDA 2020 GAT · General Knowledge · Metals, Alloys and Corrosion · easy

Metals is stored under kerosene oil in laboratories because it reacts vigorously with air and water?

Single correct option

Which one of the following metals is stored under kerosene oil in laboratories because it reacts vigorously with air and water?
  1. A. Sodium
  2. B. Copper
  3. C. Aluminium
  4. D. Gold
Show answer and solution

Answer: (A) Sodium

Sodium is a highly reactive alkali metal that catches fire in air and reacts violently with water, so it is kept immersed in kerosene. Copper and gold are unreactive, and aluminium is protected by a thin oxide layer and needs no such storage.
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Original question written in the NDA 2020 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake