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Question

Match the column I with column II and mark the appropriate choice.

Column I
(Atom)
Column II
(No. of unpaired electrons)
(A)15P(i)6 unpaired electrons
(B)24Cr(ii)2 unpaired electrons
(C)26Fe(iii)3 unpaired electrons
(D)14Si(iv)4 unpaired electrons

A
(A)(ii),(B)(i),(C)(iii),(D)(iv)
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B
(A)(i),(B)(iii),(C)(ii),(D)(iv)
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C
(A)(iii),(B)(i),(C)(iv),(D)(ii)
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D
(A)(iv),(B)(ii),(C)(i),(D)(iii)
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Solution

The correct option is D (A)(iii),(B)(i),(C)(iv),(D)(ii)
A. 15P=1s22s22p63s23p3
Valence shell configuration is: 3s23(p1x,p1y,p1z)
Number of unpaired electron=3 in 3p-orbital=(iii)

B. 24Cr=1s22s22p63s23p63d54s1
Valence shell configuration is: 4s13(d1z2,d1x2y2,d1xy,d1yz,d1zx)
Number of unpaired electron=6 in 4s and 3d-orbital=(i)

C. 26Fe=1s22s22p63s23p63d64s2
Valence shell configuration is: 4s23(d2z2,d1x2y2,d1xy,d1yz,d1zx)
Number of unpaired electron=4 in 3d-orbital=(iv)

D. 14Si=1s22s22p63s23p2
Valence shell configuration is: 3s23(p1x,p1y,p0z)
Number of unpaired electron=2 in 3p-orbital=(ii)
thus A-(iii),B-(i),C-(iv),D-(ii)

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