NEET Chemistry States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव NEET PYQ-States Of Matter

A mixture of gases contains \[{{H}_{2}}\] and \[{{O}_{2}}\] gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?                                                                                     [NEET 2015 ]

A) 1 : 4

B)      4 : 1

C) 16 : 1

D)      2 : 1

Correct Answer: B

Solution :

Let the mass of \[{{H}_{2}}\] gas be \[xg\] and mass of \[{{O}_{2}}\] gas 4xg

Molar \[{{\text{H}}_{\text{2}}}\] : \[{{O}_{3}}\]

Mass 2 : 32

i.e. 1 : 16

\[\therefore \] Molar ratio =

\[\frac{{{n}_{{{H}_{2}}}}}{{{n}_{{{O}_{2}}}}}=\frac{x/2}{4x/32}=\frac{x\times32}{2\times 4x}=\frac{4}{1}=4:1\]