NCERT Class 10 Science Chapter 1 Exercise Solutions 2021 [Updated]

NCERT Class 10 Science Chapter 1 Exercise Solutions.

NCERT Class 10 Science Chapter 1 Exercise Solutions

NCERT Class 10 Science Chapter 1 Exercise Solutions

1. Which of the statements about the reaction below are incorrect?

2PbO(s)+C(s)\rightarrow 2Pb(s)+CO_{2}(g)

(a) Lead is getting reduced.

(b) Carbon dioxide is getting oxidised.

(c) Carbon is getting oxidised.

(d) Lead oxide is getting reduced.

(i) (a) and (b)

(ii) (a) and (c)

(iii) (a), (b) and (c)

(iv) all

Ans:

2. Fe_{2}O_{3}+2Al\rightarrow Al_{2}O_{3}+2Fe

The above reaction is an example of a

(a) Combination Reaction

(b) Double Displacement Reaction

(c) Decomposition Reaction

(d) Displacement Reaction

Ans:

3. What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

(a) Hydrogen gas and iron chloride are produced.

(b) Chlorine gas and iron hydroxide are produced.

(c) No reaction takes place.

(d) Iron, salt and water are produced.

4. What is a balanced chemical equation? Why should chemical equations be balanced?

Ans: