(a). Assertion (A) is true, Reason (R) is also true, Reason (R) is the correct explanation for assertion (A).
(b). Assertion (A) is true, Reason (R) is true, Reason (R) is not the correct explanation for Assertion (A).
(c). Assertion (A) is true, Reason (R) is false.
(d). Assertion (A) is false, Reason (R) is true.
Q. Assertion (A): `Zn^(2+)` is diamagnetic.
Reason (R): The electrons are lost from 4s-orbital to form `Zn^(2+)`.

Answer

A

Explanation

Both (A) and (R) are correct and reason (R) is the correct explanation for Assertion (A).
`Zn^(2+):` the oxidation number of `Zn` is `+2`.
`Zn(Z=30)3d^(10)4s^2` `Zn^(2+)=3d^(10)`
No unpaired electron is presen hence diamagnetic.