Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

(A) $\sigma$ for 3s electron of Cl = 9.15

Cl: [Ne] 3s²3p⁵

For 3s electron:

$$\sigma =(6\times 0.35)+(8\times 0.85)+2(1.00)=9.55$$

So, the given value 9.15 is incorrect.

(B) Unpaired electrons in Fe³⁺ = 5

Fe: [Ar]3d⁶4s²

Fe³⁺: [Ar]3d⁵

d⁵ has 5 unpaired electrons.

(C) Cr³⁺ has the same unpaired electrons as V (ground state)

V: [Ar]3d³4s² → 3 unpaired electrons

Cr³⁺: [Ar]3d³ → 3 unpaired electrons.

(D) Electrons with $\ell =2$ in Mn²⁺ = 3

Mn²⁺: [Ar]3d⁵

d-electrons ($\ell =2$) = 5, not 3.

Correct Statements: B, C