Which one of the following has the correct order of ionisation energy?

Cs > Li > B

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Cs > Li > K

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Li > K > Cs

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Cs < Li < K.

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Solution

The correct option is C
Li > K > Cs

Li, K and Cs are group 1 elements. Down a group (from top to bottom), i.e., from Li to Cs, the size of atom increases and therefore, ionisation energy decreases.

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C s^{+}

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

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

C s^{+}

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