Assertion: `Yb^(+2)` is more stable in compare to `Gd^(+2)`
Reason: The electronic configuration of Gd is [Xe]`4f^(7)5d^(2)6s^(2)`

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reson are true but reason is not the correct explanation of assertion.
C. if assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

C

Explanation

`Yb^(+2)=[Xe]4f^(14),5d^(0),6s^(0)`
`Gd^(+2)=[Xe]4f^(7),5d^(1),6s^(0)`
so `Yb^(+2)` is more stable than `Gd^(+2)`.