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JEE Main · 2019 · 12 Apr 2019 · Shift 1 · Hydrogen

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The metal that gives hydrogen gas upon treatment with both acid as well as base is:
  1. (A)iron
  2. (B)magnesium
  3. (C)zinc✓ Correct
  4. (D)mercury

Answer: (C)

Solution

An amphoteric metal reacts with both acids and alkalis to release hydrogen, and zinc is the classic example. With acid, ; with base, , forming sodium zincate. Iron and magnesium react only with acids, and mercury with neither, so the metal that gives hydrogen with both is zinc.

JEE Main · 2019 · 12 Apr 2019 · Shift 1 · Single correct option

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