Q.

Incorrect set of quantum numbers from the following is :

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a

n=4,l=2,ml=2,1,0,+1,+2ms=1/2

b

n=5,l=2,ml=2,1,+1,+2,+3, ms=+1/2

c

n=5,l=3,ml=3,2,1,0,+1,+2,+3,ms=+1/2

d

n=4,l=3,ml=3,2,1,0,+1,+2,+3,ms=1/2

answer is B.

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Detailed Solution

Value of m = –l to +l
for l = 2, m = –2, –1, 0, +1, +2
As option (2) also has +3 value in m, this is the incorrect set of quantum numbers.
(1) n = 4, l = 3 (correct, because l value less than n and l = 3 corresponds to f-orbital). Value of m lies in range from –l to +l. correct set.
(3) n = 4, l = 2 (correct value of n and l, l = 2 corresponds d –orbital). Value of m lies in range – to +l, correct set.
(4) n = 5, l = 3 (correct value of l and m, l = 3 corresponds to f–orbital). Value of m lies in range –l to +l, correct set.

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