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Q.

Hydrogen combines with oxygen to form H2O in which 16g of oxygen combine with 2g of hydrogen.  Hydrogen also combines with carbon to form CH4 in which 2g of hydrogen combine with 6g of carbon.  If carbon and oxygen combine together then they will do show in the ratio of        

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a

12 : 24

b

6 : 16 or 12 : 32

c

6 : 18

d

1 : 2

answer is A.

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Detailed Solution

According to law of reciprocal proportions, taking weight of hydrogen in common in both H2O and CH4, the weight of oxygen and carbon is 16 and 6 grs respectively.  So weight ratio of carbon and oxygen in the compound also should be 16:6 (or) 32:12.  So compound should be CO2.

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