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Question

The equilibrium N2(g)+O2(g)2NO(g) established in a reaction vessel of 2.5 L capacity. The amounts of N2 and O2 taken at the start were respectively 2 moles and 4 moles. Half a mole of nitrogen has been used up at equilibrium. The molar concentration of nitric oxide is :

A
0.2
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B
0.8
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C
0.6
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D
0.1
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Solution

The correct option is C 0.6
N2+O22NO

At t = 0 2 4 0

At eq. 2-x 4-x 2x

Half a mole of nitrogen is used up at equilibrium,
x=0.5

So, moles of NO=1.

Molar conc. of NO at equilibrium =12.5=0.4.

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