NCERT Exemplar IV — task. Science CBSE, Class 9.

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Answer the following multiple choice questions:

1. Two substances, A and B were made to react to form a third substance, A2B according to the following reaction
2A + B → A2B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B
(ii) The product will always have a fixed composition
(iii) The product so formed cannot be classified as a compound
(iv) The product so formed is an element

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

2. 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

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

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20. NCERT Exemplar IV

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