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Question

The lightest liquid metal is


A

Hg

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B

Na

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C

Cs

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D

Fr

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Solution

The correct option is C

Cs


Explanation for the correct option:

(C)

  • Cs is a metal that belongs to Group-1 i.e. alkali metals.
  • At room temperature, it is liquid.
  • It is less dense than Hg (also a liquid metal).

Explanation for the incorrect options:

(A) Hg

  • Hg is a kind of metal.
  • At room temperature, it is liquid.
  • It is denser than Cs (also a liquid metal).
  • Hence this option is not correct.

(B) Na

  • Na is an alkali metal.
  • At room temperature, it is solid.
  • Hence this option is not correct.

(D) Fr

  • Fr is a metal that belongs to Group-1 i.e. alkali metals.
  • At room temperature, it is solid.
  • Hence this option is not correct.

Hence, the correct option is (C) i.e.,Cs.


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