MEDIUM
10th CBSE
IMPORTANT
Earn 100

When an iron nail is kept in copper sulphate solution, the blue colour of the solution fades and iron nail becomes brownish. Explain.

Important Questions on Chemical Reactions and Equations

EASY
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 22
What happens when carbon dioxide gas is bubbled through lime water?
(i) In small amount
(ii) In excess
MEDIUM
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 23
Write the balanced chemical equations for the following chemical reaction.
(i) Lead +Copper chloride →Lead chloride + copper
(ii) Zinc oxide +carbon →zinc + Carbon monoxide
(iii) Hydrogen + chlorine → Hydrogen chloride
EASY
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 23
''Combination reaction is the reverse of decomposition reaction". Justify this statement with the help of appropriate chemical equation of each.
HARD
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 24
State the meaning of oxidation in a chemical reaction.
EASY
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 24
Consider the chemical reaction represented by the following equation:
MnO2+4HCl→MnCl2+2H2O+Cl2 and write the name of the substances which are oxidised, reduced, oxidising agent and reducing agent in the reaction.
EASY
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 1>Q 24
Name the phenomenon due to which the taste and smell of oily food changes when kept for a long time in open. Suggest one method to prevent it.
EASY
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 2>Q 1
What is the special name given to the corrosion of iron?
MEDIUM
10th CBSE
IMPORTANT
Concise Chemistry Part 2>Chapter 1 - Chemical Reactions and Equations>MOCK TEST - 2>Q 2
What type of reaction is involved in the corrosion of iron? (Redox / Decomposition)