When ${\mathrm{N}}_2$ gas is mixed with ${\mathrm{CO}}_2$ gas the mixture is not colloidal — why ? 

Important Questions on Atomic Structure; Physical and Chemical Properties of Matter

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 3

Chalk powder is mixed with water—will it be a colloidal solution ? 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 4

What happens tartaric acid is added to milk? 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 5

What is the main composition of 'milk of magnesia'? 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 6

What is an 'emulsifier'? Give one example. 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 7

How soap removes dirt particles from cloth? 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 8

Define solubility. 

MEDIUM

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 9

Solubility of a solute depends on the nature of solvent — Give one example in favour of the statement. 

HARD

9th West Bengal Board

IMPORTANT

PHYSICAL SCIENCE & ENVIRONMENT CLASS 9>Chapter 4 - Atomic Structure; Physical and Chemical Properties of Matter>EXERCISE>Q 10

What is 'seeding agent'?