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For the reaction 2A(g)+B(g) hArr 3C(g)...

For the reaction
`2A(g)+B(g) hArr 3C(g)+4D(g)` ,brgt Two moles each of A and B were taken into a 1L flask. The following must always be true when the system attained equilibrium

A

`[A]=[B]`

B

`[A] lt [B]`

C

`[B] = [C ]`

D

`[A] +[B] lt[C ] +[D]`

Text Solution

Verified by Experts

The correct Answer is:
B
From the equation, it is clear that 2 moles of A combine with one mole of B. Let at equilibrium a moles of B have reactged. This means that 2a moles of A have reacted.
`:. `Equilibrium concentration of `A=2-2a`
Equilibrium concentration of `B=2-a`
Hence `[A] lt[B]`
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