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Question

Element P, Q react to form a compound PxQy.R and P react to form RyPz. If PxQy is a binary acid with x=2y then the acid is:

A
sulphuric acid
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B
hydrochloric acid
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C
chloric acid
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D
hydrogen sulphide
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Solution

The correct option is D hydrogen sulphide
PxQy is binary acid and x=2y

P2yQy (or) P2Q.

From the given compound, it must be H2S i.e. Hydrogen sulphide.

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