Assertion: The second ionisation energies of V, Cr and Mn are in the order `VltCrltMn`.
Reason: Ionisation energies show a regular increase along a period with increase of atomic number.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect but (R) is correct.

Answer

d

Explanation

Correct A: The correct order of `IE_(2)` is
`V lt Cr lt Mn`
Correct `R: Cr` after losing one electron has `3d^5` stable configuration from which removal of second electron is difficult.