Atomic Structure - Result Question 70

####46. Which of the following statement (s) is (are) correct ? (1998, 2M)

(a) The electronic configuration of Cr is [Ar]3d54s1 (atomic number of Cr=24 )

(b) The magnetic quantum number may have a negative value

(c) In silver atom, 23 electrons have a spin of one type and 24 of the opposite type. (atomic number of Ag=47 )

(d) The oxidation state of nitrogen in HN3 is -3

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Answer:

Correct Answer: 46. (b)

Solution:

  1. (a) Cr=[Ar]3d54s1, an exception to aufbau principle.

(b) For a given value of l,m can have any value from (l to +l), so can have negative value.

(c) Ag is in copper group with d10s1 configuration, i.e. 46 electrons are spin paired.



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