Mercury is the only metal which is liquid at $0^{o} C$ . This is due to its

high ionisation energy and weak metallic bond

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low ionisation energy and strong metallic bond

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high atomic weight

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high vapour pressure

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Solution

The correct option is D high ionisation energy and weak metallic bond
The ionization energy of mercury is very high and the metallic bonds are very weak.
Hence, mercury is the only metal which is liquid at $0^{0} C$ .

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0^{\circ} C

Assertion: The greater the ionisation energy the greater the non-metallic character.

Reason: Metals are electron accepting and non-metals are electron donating.

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