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Standard VIII

Chemistry

Need for Balancing

Question 9Two...

Question

Question 9
Two chemical species 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 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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Solution

The answer is (d).
In this reaction, X and Y cannot 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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Similar questions

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)

Q. Two chemical species

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and

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combine together to form a product

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which contains both

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and

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X + Y \to P

X

and

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X, Y

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P

are correct?

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(ii)

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and

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(iii)

X

and

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(iv)

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Q. Two chemical species 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 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.

Q. The co-ordinates of two points P and Q are x and y respectively.
Find d(P,Q) in the following cases.
(i) x = 7, y = 10
(ii) x = -2, y = 11
(iii) x = -8, y = -3
(iv) x = 5,y = -9

Q. Question 2
Find p(0), p(1) and p(2) for each of the following polynomials:
(i)

p (y) = y^{2} - y + 1

(ii)

p (t) = 2 + t + 2 t^{2} - t^{3}

(iii)

p (x) = x^{3}

(iv)

p (x) = (x - 1) (x + 1)

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Need for Balancing

Standard VIII Chemistry

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