JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mc157
A mixture of 1.2 g of carbon and 1.6 g of sulphur is burnt completely in excess oxygen to give only COX2 and SOX2 (C=12, S=32, O=16). Which statements are correct? Use 22.4 L/mol at STP.
AThe mass of OX2 consumed is 4.8 g
BThe mole fraction of SOX2 in the product gas is 1/3
CThe mass of the product gas mixture is 2.8 g
DThe product gas mixture occupies 3.36 L at STP
Answer: A, B, D
Moles: C = 0.1, S = 0.05. Gas products = 0.15 mol = 3.36 L (true). OX2 used = 0.1 + 0.05 = 0.15 mol = 4.8 g (true). Product mass = 0.1 x 44 + 0.05 x 64 = 7.6 g, not 2.8 g (false). x(SOX2) = 0.05/0.15 = 1/3 (true).