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When a mixture consisting of 10 moles of...

When a mixture consisting of 10 moles of `SO_2` and 16 moles of `O_2` were passed over a catalyst , 8 mole of `SO_3` were formed at equilibrium.The number of moles of `SO_2` and `O_2` which did not enter into reation were :

A

2,12

B

12,2

C

3,10

D

10,3

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The correct Answer is:
A
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