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SSC CGL 2024 PYQ — Question 50

SSC CGL - 24 Sep 2024 - Shift 2 • General Awareness • Q50

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Which gas is evolved when iron and water react?

Show answer & explanation

Correct answer: A

Explanation

The correct answer is option 1 i.e. Hydrogen

When iron reacts with water, typically in the form of steam and at high temperatures, hydrogen gas is evolved. The reaction can be represented as:

3Fe+4H2O(g)→Fe3O4+4H2(g)3Fe + 4H_2O (g) \rightarrow Fe_3O_4 + 4H_2 (g)3Fe+4H2​O(g)→Fe3​O4​+4H2​(g)

In this reaction, iron (Fe) reacts with water (H₂O) to form iron oxide (Fe₃O₄), commonly known as magnetite, and hydrogen gas (H₂) is released. This reaction requires high temperatures because iron does not readily react with liquid water under normal conditions.