MEDIUM
10th CBSE
IMPORTANT
Earn 100

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.

Important Questions on Chemical Reactions and Equations

HARD
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 28
Why do fireflies glow at night?
MEDIUM
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 29
Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?
EASY
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 30

Evaporation of petrol is a physical or chemical change?

EASY
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 30

Burning of Liquefied Petroleum Gas (LPG) is a physical or chemical change?

EASY
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 30

 Heating of an iron rod to red hot is a physical or chemical change?

EASY
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 30

Curdling of milk is a physical or chemical change?

EASY
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 30

Sublimation of solid ammonium chloride is a physical or chemical change?

MEDIUM
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 1 - Chemical Reactions and Equations>Short Answer Type Questions>Q 31

During the reaction of some metals with dilute hydrochloric acid, following observation were made. Explain this observation giving suitable reasons.

 Silver metal does not show any change.