Question

7.5 grams of a gas occupy 5.6 litres of volume at STP. The gas is (Atomic weights of C, N and O are 12, 14 and 16 respectively)

• A. $NO$
• B. $N_2O$
• C. $CO$
• D. $CO_2$

Answer 1

Answer: (A)

$NO$

Answer 2

$5.6 \,L$ of a gas at STP weights $= 7.5\, g$ $22.4\, L$ of a gas weights $=\frac{22.4\times7.5}{5.6}=30\,g$ $\therefore$ Molecular weight is 30 g and the gas is $NO$.