Which of the following pairs of elements corresponds to marginal increase in $I P$ values along a period?

C r, M n

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T i, Z r

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Z r, H f

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K, C a

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Solution

The correct option is C $C r, M n$
Marginal increase in $I P$ values is found in transition elements. As chromium and manganese are successive elements in transition series and belong to the same period, a marginal increase is found in $I P$ values.

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