Question

Two chemical species X and Y combine together
to from 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?
(1)P is a compound.
(2)X and Y are compounds.
(3)X and Y are elements.
(4)P has a fixed composition

Options:
(a)=(1),(2)and(3)
(b)=(1),(2)and(4)
(c)=(2),(3)and(4)
(d)=(1),(3)and(4)​

Answer 1

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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 .