The correct order of decreasing first ionisation potential is : (a)...

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The correct order of decreasing first ionisation potential is :
(a) \( \mathrm{Ca}\mathrm{K}\mathrm{Rb}\mathrm{Cs} \)
(b) \( \mathrm{Cs}\mathrm{Rb}\mathrm{K}\mathrm{Ca} \)
(UP CPMT 2013)
\( \mathrm{P} \)
(c) \( \mathrm{Ca}\mathrm{Cs}\mathrm{Rb}\mathrm{K} \)
(d) \( \mathrm{K}\mathrm{Rb}\mathrm{Cs}\mathrm{Ca} \)
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