Neet Solved Paper 2015 Question 17
Question: 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?
Options:
A) 1 : 4
B) 4 : 1
C) 16 : 1
D) 2 : 1
Show Answer
Answer:
Correct Answer: B
Solution:
Let the mass of $ H _2 $ gas be $ xg $ and mass of $ O _2 $ gas 4xg Molar $ H _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\times 32}{2\times 4x}=\frac{4}{1}=4:1 $
