Q.

The correct order of decreasing first ionisation potential is :

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a

Ca > K> Rb > Cs

b

Cs > Rb > K> Ca

c

Ca > Cs > Rb > K

d

K> Rb > Cs > Ca

answer is A.

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Detailed Solution

Ionisation potential ∝1 atomic size As the atomic size increases down the group but decreases in a period.∴The correct order of decreasing first ionisation potential is Ca > K > Rb > Cs.
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