MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryChemical EquilibriumEquilibrium Constant & Concentrations

The vapour density of completely dissociated NH4Cl would be

A.Slight less than half that of NH4Cl

B.Half that of NH4Cl✓ Correct

C.Double that of NH4Cl

D.Determined by the amount of solid NH4Cl in the

Explanation

The vapour density of completely dissociated 4 NH Cl is half than that of pure 4 NH Cl . Because no. of moles after dissociation becomes double and molar mass comes out to be half. Initialvapourdensity Totalmolesof gas at equilibrium Vapourdensityatequilibrium Initialmolesof gaseousreactant 4 4 NH Cl g NH Cl C 0 0 C 1 C C C 1 2C D d C C 1 2 D d C >> D 1 ; 1 d complete dissociation D 2 d D d 2 >>

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