Which of the following has been arranged in the order of increasing bond strength?

Z n_{2}^{2 +} < H g_{2}^{2 +} < C d_{2}^{2 +}

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C d_{2}^{2 +} < H g_{2}^{2 +} < Z n_{2}^{2 +}

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Z n_{2}^{2 +} < C d_{2}^{2 +} < H g_{2}^{2 +}

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H g_{2}^{2 +} < C d_{2}^{2 +} < Z n_{2}^{2 +}

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Solution

The correct option is C $Z n_{2}^{2 +} < C d_{2}^{2 +} < H g_{2}^{2 +}$
Due to poor shielding of '4f' electrons, bond strength is maximum for $H g^{+} - H g^{+}$ .

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