Question

A. MCQs-Choose the correct answers.

1. Which of the following is a chemical change?
(a) melting of ice cream.
(b) ironing of clothes.
(c) burning of petrol.
(d) drying of hair.

2. Which of these cannot prevent rusting of iron?
(a) galvanisation.
(b) alloying.
(c) cooking.
(d) greasing.


3. The gas produced when zinc reacts with dilute
hydrochloric acid is.
(a) carbon dioxide.
(b) hydrogen.
(c) oxygen.
(d) none of these.

4. Most physical changes are.
(a) irreversible.
(c) reversible.
(d) none of these.
(b) permanent.

5. Which elements are used in making iron sulphide?
(a) iron
(b) sulphur
(c) both (a) and (b)
(d) none of these​

Answer 1

Answer:

1. melting of ice cream.
2. cooking

Explanation:

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Answer 2

Answer:

1. burning of petrol

2.cooking

3.none of these

4.c

hope it will help you,,,,