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Compounds

Two chemical ...

Question

Two chemical substances X and Y combine together to form a product P which contains both X and Y

$X + Y \to P$

X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning 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

(a) (i), (ii) and (iii) (b) (i) , (ii) and (iv)

(c) (ii), (iii) and (iv) (d) (i), (iii) and (iv)

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Solution

Answer: (d). (i), (iii) and (iv).

In this reaction, X and Y can not be broken down into simpler substances by chemical reactions, therefore, X and Y are elements.

A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass, therefore,P is a compound, having a fixed composition.

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