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Two solids X and Y dissociate into gaseo...

Two solids X and Y dissociate into gaseous products at a certain temperature as follows:
i. `X(s) hArr A(g)+C(g)` and
ii. `Y(s) hArr B(g)+C(g)`
At a given temperature, pressure over excess solid 'X' is `40` mm of Hg and total pressure over solid 'Y(s)' is `60` mm of Hg.
Now, answer the following questions:
The ratio of moles of A and B in the vapour state over a mixture of solids X and Y, is:

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