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Q.

Mercury is the only metal which is liquid at 00C. This is due to

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a

high atomic weight

b

very high ionisation energy and weak metallic bond 

c

low ionisation energy

d

high vapour pressure

answer is A.

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Detailed Solution

 Mercury is a heavy metal  But it exists as a liquid (pure form)  at  room temperature and slowly forms a vapour in the air.

It is because of high I.P & weak metallic bond.

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