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Question Paper from: IIT JEE Main 2021 TestSeries Paper 1

Match the metal ions given in Column - I with the magnetic moments of the ions given in column - II and assign the correct code

Column I	Column II
a) Co³⁺	i) $8$ B.M.
b) Cr³⁺	ii) $35$ B.M.
c) Fe³⁺	iii) $3$ B.M.
d) Ni²⁺	iv) $24$ B.M.
	v) $15$ B.M.

a $\to$ iv

b $\to$ i

c $\to$ ii

d $\to$ iii

a $\to$ i

b $\to$ ii

c $\to$ iii

d $\to$ iv

a $\to$ iv

b $\to$ v

c $\to$ ii

d $\to$ i

a $\to$ iii

b $\to$ v

c $\to$ i

d $\to$ ii

Solution:

Chapter Name: D and F Block Elements

Difficulty Level: Moderate

$μ = n (n + 2)$ BM

Co³⁺ = 3d⁶4s⁰ $4 (4 + 2) = 4 \times 6 = 24$

Cr³⁺ = 3d³4s0 $3 (3 + 2) = 3 \times 5 = 15$

Fe³⁺ = 3d⁵4s⁰ $5 (5 + 2) = 5 \times 7 = 35$

Ni²⁺ = 3d⁸4s⁰ $2 (2 + 2) = 2 \times 4 = 8$

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IIT JEE Main 2021 TestSeries Paper 1

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