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Question

Choose the metal that does not react with acid to give off hydrogen-


A

Cu

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B

K

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C

Na

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D

Al

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Solution

The correct option is A

Cu


Explanation for Correct answer:-

option(a) Cu:

  • Hydrogen(H) lies above Copper(Cu) and the metals that are below Hydrogen(H) are less reactive than Hydrogen(H) and do not react with acids to give off Hydrogen(H).
  • Hence, (a) is correct option.

Explanation for incorrect answer:-

Option(b) K:

  • Potassium(K) lies above Hydrogen(H) and hence reacts with acids to give off Hydrogen(H).
  • Hence, incorrect option.

Option(c) Na:

  • Sodium(Na) also lies above Hydrogen(H) in reactivity series and hence reacts with acids to give off Hydrogen(H).
  • Hence, incorrect option.

Option(d) Al:

  • In the reactivity series, Aluminium(Al) also lies above Hydrogen(H) and hence reacts with acids to give off Hydrogen(H).
  • Hence, incorrect option.

Therefore, Copper(Cu) is the metal that reacts with acids to give off Hydrogen(H).


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