Ionisation energy in group 1A varies in the decreasing order as
(a) Li > Na > K > Cs
(b) Na > Li > K >Cs
(c) Li > Cs > K > Na
(d) K > Cs > Na > Li
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Ionisation energy in group 1A varies in the decreasing order as
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(b) Na > Li > K >Cs
(c) Li > Cs > K > Na
(d) K > Cs > Na > Li
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