The correct order of electropositive nature of $L i, N a$ and $K$ is :

L i > N a > K

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L i > K > N a

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N a > K > L i

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K > N a > L i

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Solution

The correct option is D $K > N a > L i$
Electropositivity increases down the group in a periodic table because of increase in size and decrease in ionisation enthalpy.

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

The order of decreasing ionisation enthalpy in alkali metals is
(a) Na> Li > K> Rb (b) Rb< Na< K< Li
(c) Li > Na> K> Rb (d) K< Li < Na < Rb

What will be the order of $I^{s t}$ ionisation energy?

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