Question

C. Tick (~) the most appropriate answer.

1. Which of the following is not correct about a chemical change?

(a) Formation of a new substance

(b) Generally irreversible

(c) No change in chemical composition

(d) Permanent change

2. Burning of candle is an example of:

(a) only physical change

(b)only chemical change

(c) both physical and chemical change

(d) natural change

3. Which of the following changes cannot be reversed?

(a) Melting of ice

(b) Cooking of food

(c) Boiling of water

(d) Heating of iron wire

4. A physical change differs from a chemical change when:
(i) no new substance is formed

(ii) physical properties change

(iii) chemical properties change

(iv) energy is released

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iv)

5. The equation that represents a chemical change is:

(a) ice
water

(b) water steam

(c) carbon + oxygen
→ carbon dioxide (d) water + common salt — solution of common salt

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Answer 1

Answer:

1- c is the correct option.

2- a is the correct option.

3- b is the correct option.

4- c is the correct option.

5- c is the correct option

Explanation:

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Answer 2

Answer:

1. c
2. a
3. b
4. c
5. c

Explanation:

these are the correct answers