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Question

The alkali metals are low melting. which of the following alkali metals is expected to melt if the room temperature rises to 300C?

A
Na
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B
K
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C
Rb
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D
Cs
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Solution

The correct option is D Cs
Atomic size increases down the group from Na to Cs so, the strength of metallic bonding decreases and hence, the melting point also decreases.

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