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Q.

40 ml of a hydrocarbon undergoes combustion in 260ml of oxygen and gives 160ml of CO2.If all volumes  are measured under similar conditions of temperature and pressure, the formula of the hydrocarbon is

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a

C4H8

b

C6H14

c

C3H8

d

C4H10

answer is D.

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Detailed Solution

\large {C_x}{H_y} + \left( {x + \frac{y}{4}} \right){O_2} \to xC{O_2} + \frac{y}{2}{H_2}O\
40\;ml\;\;\;\;\;\large 40\left( {x + \frac{y}{4}} \right)\;\;\;\;\;\;\;\;\;\;\;\40x\

Given

40x = 160

x = 4

\large 40\left( {x + \frac{y}{4}} \right)\ = 260

4x + y = 26

4(4) + y = 26

y = 10

Hydrocarbon is C4H10

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