Q.

On combustion in excess oxygen, 500ml of cyanogen gives 500ml of N2 and 1000ml. of CO2 measured at same temperature and pressure. What is the formula of Cyanogen?

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a

CN2

b

C3N2

c

C2N3

d

C2N2

answer is D.

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Detailed Solution

Balanced chemical equation for the combustion of cyanogen (CnN2) in excess oxygen:

                    CnN2 + (n+1)O2 → nCO2n2N2

given               500mL              1000mL   500mL

                          1 L                       2 L           1 L

The volume is directly proportional to the number of moles.

Thus, 1 mole of cyanogen on combustion will give 2 moles of CO2 and 1 mole of N2.

Thus, the molecular formula of the hydrocarbon is C2N2.

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On combustion in excess oxygen, 500ml of cyanogen gives 500ml of N2 and 1000ml. of CO2 measured at same temperature and pressure. What is the formula of Cyanogen?