SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 1

HARD

10th Mizoram Board

IMPORTANT

Earn 100

A solution of a substance ‘X’ is used for whitewashing.
(i) Name the substance ‘X’ and write its formula.
(ii) Write the reaction of the substance ‘X’ named in (i) above with water

Important Questions on Chemical Reactions and Equations

HARD

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 2

Why is the amount of a gas collected in one of the test tubes in ‘Electrolysis of water’ activity double of the amount collected in the other? Name this gas.

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 1

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 2

Give an example of a double displacement reaction?

HARD

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 3

Identify the substances that are oxidized and the substances that are reduced in the following reaction:

4 N a (s) + O_{2} (g) \to 2 {N a}_{2} O (s)

HARD

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>QUESTIONS>Q 3

Identify the substances that are oxidized and the substances that are reduced in the following reaction:

C u O (s) + H_{2} (g) \to C u (s) + H_{2} O (l)

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>EXERCISES>Q 1

Which of the statements about the reaction below are incorrect?

2 P b O (s) + C (s) \to 2 P b (s) + C O_{2} (g)

(i)

Lead is getting reduced.

(i i)

Carbon dioxide is getting oxidised.

(i i i)

Carbon is getting oxidised.

(i v)

Lead oxide is getting reduced.

MEDIUM

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>EXERCISES>Q 2

{Fe}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Fe

The above reaction is an example of a:

EASY

10th Mizoram Board

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS X>Chapter 1 - Chemical Reactions and Equations>EXERCISES>Q 3

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