MEDIUM
8th Chhattisgarh Board
IMPORTANT
Earn 100

Give two examples for the reaction in which heat is liberated?

Important Questions on Chemical Reactions When and What Type

MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 3
Give two examples for the reaction in which colour is changed?
HARD
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 4

Some reactions are given below. Identify the chemical reactions and write the reasons.

Melting of ice.

Dissolution of sugar in water.

Burning of wood.

Blackening of pieces of potatoes, brinjals and apples.

Melting of wax. Blackening of silver ornaments.

Souring of milk.

Synthesis of food by green plants in presence of sunlight.

MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 5

Point out the difference between:

Oxidation and reduction

MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 5

Point out the difference between:

Combination and decomposition

MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 6
Write the characteristics of a chemical reaction.
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 7
Give an example of a reaction which shows more than one of the chemical characteristics?
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 8
Enlist various chemical changes that you come across in your daily life and also classify or categorise them.
MEDIUM
8th Chhattisgarh Board
IMPORTANT
Science & Technology Class - VIII>Chapter 4 - Chemical Reactions When and What Type>QUESTIONS FOR PRACTICE>Q 9
When Seema tasted glucose, she felt cold in the tongue. Why did she feel so? What is this reaction called?