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a
1 mole of carbon dioxide
b
4g of hydrogen
c
6g of helium
d
33.6 litres of oxygen at STP
answer is B.
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Detailed Solution
1st option1 mole of CO2 contain NA molecules2nd option2g of Hydrogen NA molecules4g of Hydrogen 2NA molecules3rd option4g of Helium contain NA atoms6g of Helium contain 1.5 NA atoms4th option22.4l of Oxygen at STP contain NA molecule33.6l of Oxygen at STP contain 1.5NA molecule4g of Hydrogen contains maximum number of molecules.