Question

1. Select the correct option:

1. When hydrogen sulphide gas is passed through copper sulphate solution, a black precipitate
is formed of:
(a) sulphuric acid
(b) copper sulphide
(C) copper sulphate
(d) hydrogen sulphide

2. Burning of magnesium in the air forms
(a) magnesium carbonate
(b) magnesium sulphate
(C) magnesium oxide
(d) none of these

3. Which of the following does not involve a chemical reaction?
(a) magnesium oxide
(b) magnesium carbonate
(c) magnesium sulphate
(d) none of these

4. The chemical reaction between quick lime and water is characterised by:
(a) evolution of hydrogen gas.
(b) formation of slaked lime precipitate.
(d) change in colour of the product.
C) change in temperature of mixture


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Answer 1

1. b)

2.a)

3.d)

4.a)

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Answer 2

Answer:

Q1 = (A) Sulphuric acid

Q1 = (A) Sulphuric acidQ2 = (C) Magnesium oxide

Q1 = (A) Sulphuric acidQ2 = (C) Magnesium oxideQ3 = (B) Magnesium carbonate

Q1 = (A) Sulphuric acidQ2 = (C) Magnesium oxideQ3 = (B) Magnesium carbonateQ4 = (C) Change in the temperature of mixture

Explanation:

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