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Question

A compound A dissociate by two parallel first order paths at certain temperature
A(g)k1(min1)−−−−−2B(g) k1=6.93×103min1
A(g)k2(min1)−−−−−C(g) k2=6.93×103min1
The reaction started with 1 mole of pure 'A' in 1 litre closed container with initial pressure 2 atm. What is the pressure (in atm) developed in container after 50 minutes from start of experiment?

A
1.25
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B
0.75
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C
1.50
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D
2.50
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Solution

The correct option is D 2.50
For both reactions, half life is 100 min so after 50 min no. of moles of all reagents in solution is 1.25 mole. So the pressure of the container is 2×1.25/1=2.50 atm.

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