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Question

Which of the following is incorrect with respect to metals?


A

If one of the metals is mercury, then the alloy is known as an amalgam.

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B

The metals high up in the reactivity series are very reactive.

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C

Metals above hydrogen in the activity series cannot displace hydrogen from dilute acids.

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D

Metals reacts with dilute acid to form its salt and hydrogen gas.

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Solution

The correct option is C

Metals above hydrogen in the activity series cannot displace hydrogen from dilute acids.


  • Alloys that contain mercury are known as amalgams.
  • The metals high up in the reactivity series are very reactive.
  • More reactive metals can replace less reactive metals.
  • Metals which are above hydrogen in the reactivity series will displace hydrogen from dilute acids.

For example: Fe(s)+CuSO4(aq)FeSO4(aq)+Cu(s)

Here, iron is more reactive than copper. So, it displaces copper from its solution.


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