Two chemical species X and Y combine together to form a product P which contains both X and Y, X + Y → P, X and Y cannot be broken down into simpler substances by simple chemical reactions. The following concerning the species X, Y and P are correct?
(i)P is a compound.
(ii) X and Y are compounds.
(iii)X and Y are elements.
(iv)P has a fixed composition.
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[D] (i), (iii) and (iv)
In this reaction X and Y cannot be broken down into simpler substances by chemical reactions, so X and Y are elements. A compound is a substance composed of two or more elements that are chemically combined in a fixed ratio by mass, so P is a compound with a definite composition.