Question

6. 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. Which of 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​

Answer 1

(Option iv) P HAS A FIXED COMPOSITION

REASON - 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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Answer 2

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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 . Which of 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

• (a) (i) , (ii) and (iii)

• (b) (i) , (ii) and (iv)

• (c) (ii) , (iii) and (iv)

• (d) (i) , (iii) and (iv) ✔️

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

• P is a compound because it is formed due to combination of two chemical species X and Y .

• X and Y are elements because they cannot be broken down into simpler substances by simple chemical reactions .

• P has a fixed composition because it is formed due to combination of X and Y in fixed ratio .

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• Elements

A substance that cannot be broken down into simpler substances by chemical means . An element is composed of atoms that have the same atomic number .

• Compounds

Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio .