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Compounds of Pnictogens-Trends

The inter nuc...

Question

The inter nuclear distance in $H_{2}$ and $C l_{2}$ molecules are 74 & 198 pm. respectively.The bond length of HCl may be:

[EN of H = 2.1 Cl = 3.0]

136 pm

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272 pm

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135.919 pm

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271.919 pm

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Solution

The correct option is A 136 pm
$r_{H_{2}} = 74 p m / 2 = 37 p m$
$r_{C l_{2}} = 198 p m / 2 = 99 p m$
$∴$ Bond length of $H C l = r_{H_{2}} + r_{C l_{2}} = 37 + 99 = 136 p m$

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