I. H = 1s1 

II. N = 1s2 2s2 p3 

III. O = 1s2 2s2 p4 

IV. Zn = 1s2 2s2 2p6 3s2 3p6 4s2 3d10

A. I and II
B. I and III
C. I and IV
D. III and IV

Correct Answer:

Option A – I and II

SEE ALSO  The volume occupied by 0.4 g of hydrogen gas at s.t.p. is? [H = 1. 00; Molar volume at s.t.p. = 22.4 dm³]

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