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Which of the following statement(s) are ...

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

A

1,2,3

B

2,3,4

C

3,4

D

1,2,4

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The correct Answer is:
A
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Which one 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 has a spin of one type and 24 of the opposite type. (Atomic No. of Ag = 47) (D) The oxidation state of nitrogen in NH_(3) is -3 .

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