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Question

The molar conductances of NaCl,HCl and CH3COONa at infinite dilution are 126.45,426.16 and 91 ohm1cm2mol1 respectively. The molar conductance of CH3COOH at infinite dilution is:

A
201.28 ohm1cm2mol1
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B
390.71 ohm1cm2mol1
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C
698.28 ohm1cm2mol1
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D
540.48 ohm1cm2mol1
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Solution

The correct option is B 390.71 ohm1cm2mol1
ΛNaCl=ΛNa++ΛClΛHCl=ΛH++ΛClΛCH3COONa=ΛNa++ΛCH3COOLet,ΛNa+=x,ΛCl=y,ΛH+=z,ΛCH3COO=wGiven,x+y=126.45y+z=426.16x+w=91
From the above 3 equations, value of z+w=390.71

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