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Question

Bond distance CH in CH4 is x A and that of SiH in SiH4 is y A. CSi bond is z A. Calculate covalent radii of H atom igonoring the electronegativity difference.

A
x+y+z2
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B
x+yz2
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C
xyz2
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D
x+y2
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Solution

The correct option is B x+yz2
Consider
The radius of H atom =rH A
The radius of C atom =rC A
The radius of Si atom =rSi A
Given bondlength of CH=x A
Bond length of SiH=y A
Bond length of CSi=z A
Value of bond length of C - H
rH+rC=x(i)
Value of bond length of Si-H
=rSi+rH=y(ii)
Value of bond length of C-Si
=rC+rSi=z(iii)
Solving (i) (ii) and (iii)
Value of rH=x+yz2 A

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