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Q.

0.75 mole of a solid X4 and 2 moles of O2(g) are heated in a sealed vessel, completely using up the reactants and produces only one compound.
It is found that when the temperature is used to initial temperature, the contents of the vessel exhibit a pressure equal to 12 of the original pressure.
The formula of the product will be

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a

X2O3

b

X3O8

c

X3O4

d

XO2

answer is C.

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Detailed Solution

As both the reactants are consumed completely, thus the ratio of stoichiometric coefficients would be 0.75 :2 or 3 : 8.

So, 3X4+8O2 Product 

Now, as final pressure is half of oxygen initially, thus the molecular formula will be X3O4 to balance the equation correctly.

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