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What is the density of sulphur dioxide (SO2) at STP -

(1) 2.86 gm/lit. 

(2) 1.76 gm/lit

(3) 1.86 gm/lit 

(4) None of these.

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Correct Answer is: (1) 2.86 gm/lit. 

The gram molecular weight of SO2 = 64 gm/ mole.

Since 1 mole of SO2 occupies a volume of 22.4 litres at S.T.P.

Density of SO2 = 64/22.4 = 2.86 gm/lit.

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