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Question

Which one of the following pairs of substances on reaction will not evolve H2 gas?
  1. Iron and H2SO4 (aq.)
  2. Iron and steam
  3. Copper and HCl (aq.)
  4. Sodium and ethanol

A
Iron and H2SO4 (aq.)
B
Iron and steam
C
Copper and HCl (aq.)
D
Sodium and ethanol
Solution
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Metals generally react with acids to give metal salt and hydrogen gas. However, when testing copper with acids, it was found that no bubbles are produced and the temperature also remained unchanged. This shows that copper does not react with dilute HCl. So, hydrogen gas is also not evolved.

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