First slide

Classical atomic models

Question

Match the species in Column I with their related properties in Column II.(Atomic Number is indicated in brackets in Column-I)

Moderate

A

P-1,3; Q-2,4; R-3,4; S-1,3,4
B

P-1; Q-2,3; R-1,4; S-4
C

P-1,3; Q-1,2,3; R-1,2; S-1,2,4
D

P-3; Q-4; R-3,4; S-1,4

Solution

Paramagnetic due to unpaired electron and sum of spin
$= 3 \times \frac{1}{2} = 1.5$
Thus, (P-1, 3)
Paramagnetic and coloured due to unpaired electrons in 3d
Sum of spin = 1.5
Thus, (Q-1, 2, 3)
Coloured and paramagnetic
Sum of spin = 2.5
Thus, (R-1, 2)
Coloured and paramagnetic
Sum of spin = 2.0
Magnetic moment $= \sqrt{N (N + 2)}$
$= \sqrt{4 (6)}$
$= \sqrt{24} B M$
Thus, (S-1, 2, 4)

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