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Question

Metals generally react with dilute acids to produce Hydrogen gas. Which one of the following metals does not react with dilute Hydrochloric acid?


A

Magnesium

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B

Aluminum

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C

Iron

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D

Copper

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Solution

The correct option is D

Copper


Explanation for correct option:

Option (D) Copper

  • The metals can easily lose their electrons and form cations.
  • The only metals that are able to replace the Hydrogen atom to form metal halide can produce Hydrogen gas with Hydrochloric acid.
  • For that, the metals should be placed above the Hydrogen atom in the reactivity series of metals.
  • Metals that are placed below the hydrogen atom in the reactivity series can't replace the Hydrogen atom.

  • Since Copper is placed below the Hydrogen atom in the reactivity series of metals it can't replace the Hydrogen atom.
  • Hence correct option

Explanation for incorrect options:

Option (A) Magnesium

  • Since Magnesium is placed above the Hydrogen atom in the reactivity series of metals it can replace the Hydrogen atom to form Magnesium chloride.
    Mg(s)Magnesium+2HCl(aq)HydrochloricacidMgCl2(aq)Magnesiumchloride+H2(g)Hydrogen
  • Hence incorrect option

Option (B) Aluminium

  • Since Aluminium is placed above the Hydrogen atom in the reactivity series of metals it can replace the Hydrogen atom to form Aluminium chloride.

2Al(s)Aluminium+6HCl(aq)Hydrochloricacid2AlCl3(aq)Aluminiumchloride+3H2(g)Hydrogen

  • Hence incorrect option

Option (C) Iron

  • Since Iron is placed above the Hydrogen atom in the reactivity series of metals it can replace the Hydrogen atom to form Iron chloride.

Fe(s)Iron+2HCl(aq)HydrochloricacidFeCl2(aq)Ironchloride+H2(g)Hydrogen

  • Hence incorrect option

Hence the Option (D) Iron is the correct answer


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