Which of the following does not show variable valency?

M n

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F e

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Z n

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C r

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Solution

The correct option is B $Z n$
The electronic configuration of zinc is $[A r] 3 d^{10} 4 s^{2}$ .

It can only lose two electrons from the $4 s$ orbital and show $+ 2$ oxidation state.

It does not show variable valency.

However, all other transition metals like $M n, F e, C r$ have partially filled $d$ orbitals and hence, show variable valency.

Option C is correct.

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Similar questions

Zn and Cd do not show variable valency because:

V^{2 +} < C r^{2 +} < M n^{2} < F e^{2 +}

N i^{2 +} < C o^{2 +} < F e^{2 +} < M n^{2 +}

C o^{3 +} < F e^{3 +} < C r^{3 +} < S c^{3 +}

S c < T i < C r < M n

Z n, C d

H g

E^{\circ}

M n^{3 +} / M n^{2 +}

(+ 1.57 V)

C r^{3 +} / C r^{2 +}

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