A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?
(a) 16 : 1
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1
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Answer - (d) 4 : 1
H2 and O2 are present in 1 : 4 ratio, thus lets assume 100g od H2 and 400g of O2
no. of moles of Hydrogen = 100/2 = 50
no.of moles of Oxygen = 400/32 = 12.5
ratio = 50 : 12.5 → 4 : 1
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