Which of the following has lowest melting point?

L i

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N a

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K

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C s

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Solution

The correct option is B $C s$
The physical and chemical properties of the alkali metals can be explained by their having an ns1 valence electronic configuration which results in weak metallic bonding. Hence all alkali metals are soft and have low melting point. Moving down the group this melting point decreases.

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N a^{+}, K^{+}, L i^{+}

C s^{+}

The correct order of reactivity of alkalimetals towards $H_{2}$ is

C s^{+}

L i, N a, K,

R b, L i

L i

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