Question

Which of the following statement (s) is (are) correct ?
A. The electronic configuration of `Cr` is `[Ar]3d^(5),4s^(1)` (Atomic No. of `Cr=24`)
B. The magnetic quantum number may have a negative value
C. In silver atom 23 electrons have spin of one type and 24 of the opposite type (Atomic No. of Ag =`47`)
D. The oxidation state of nitrogen in `HN_(3)` is `-1//3`

Answer 1

Only (D) is wrong because oxidation state of N in `HN_(3)` is `-1//3`
So, (A),(B) and (C ) are the correct answer.