Question

(C) ) and (1)
(d) and is
69. Two chemical substances X and Y combine together to form a product P which contains both and
X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the folle
statements concerning X, Y and P are correct?
(i) P is a compound
(in) X and Y are compounds
(iii) X and Y are elements
(iv) P has a fixed composition
(a) (i), (ii) and (ii)
(b) (). (ii) and the
(c) (i), (iii) and (iv)
(d) (i), (in) and (io)
70. Which of the following does not have a fixed melting point/boiling point?
(a) gold
(b) ethanol
() expen​

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 .