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The number of sulphur atoms present in 0.2 mole of sodium thiosulphate is N=Avogadro number   

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a
4N
b
0.2N 
c
0.4N 
d
0.4N 

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detailed solution

Correct option is C

The formula of sodium thiosulphate, Na2S2O3

1 mol of Na2S2O32 mol 'S' atoms

0.2 mol of Na2S2O3 contains 0.2×2=0.4mol ‘S’ atoms.

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