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Q.

At identical temperature and pressure the rate of diffusion of hydrogen gas is 33 times that of a hydrocarbon having molecular formula CnH2n−2. The value of n is:

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answer is 4.

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Detailed Solution

rH2rHC=MHCMH233=MHC2  or  MHC=(33)2×2=54∴CnH2n−2, 12×n+(2n−2)=54 or  n=4
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At identical temperature and pressure the rate of diffusion of hydrogen gas is 33 times that of a hydrocarbon having molecular formula CnH2n−2. The value of n is: