JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Topic Test - Some Basic Concepts of Chemistry (8-5-21)

A gaseous mixture contains \[C{{H}_{4}}\] and \[{{C}_{2}}{{H}_{6}}\] in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is

A) 4.6 g

B) 1.6 g

C) 2.3 g

D) 23 g

Correct Answer: C

Solution :

[c] Equimolecular proportion means both gases occupied equal volume \[=\frac{2.24}{2}=1.12L\]

For \[C{{H}_{4}}\]:

22.4L \[C{{H}_{4}}\]has mass \[=16gm\]

1.12L \[C{{H}_{4}}\]has mass \[=\frac{16}{22.4}\times 1.12=0.8gm\].

For \[{{C}_{2}}{{H}_{6}}\]

22.4L \[{{C}_{2}}{{H}_{6}}\]has mass = 30gm

1.12L\[{{C}_{2}}{{H}_{6}}\]has mass \[=\frac{30}{22.4}\times 1.12\]\[=\frac{3.0}{2}gm=1.5gm\]

Total mass \[=1.5gm+0.8gm=2.3gm\].