MEDIUM
9th CBSE
IMPORTANT
Earn 100

Smoke and fog both are aerosols. In what way are they different?

Important Questions on Is Matter Around Us Pure?

EASY
9th CBSE
IMPORTANT
Classify the following as Physical property or Chemical property.
The composition of a sample of steel is 98%iron, 1.5% carbon and 0.5% other elements.
EASY
9th CBSE
IMPORTANT
Classify the following as Physical property or Chemical property.
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
EASY
9th CBSE
IMPORTANT
Classify the following as Physical property or Chemical property.
Metallic sodium is soft enough to be cut with a knife.
EASY
9th CBSE
IMPORTANT
Classify the following as Physical property or Chemical property.
Most metal oxides form alkalis on interacting with water.
MEDIUM
9th CBSE
IMPORTANT

The teacher instructed three students 'A, 'B' and 'C' respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100mL of water, 'B' dissolved 50g of NaOH in 100 g of water while 'C' dissolved 50g of NaOH in water to make 100mL of solution. Which one of them has made the desired solution and why?

EASY
9th CBSE
IMPORTANT
Name the process associated with the following:
Dry ice is kept at room temperature and at one atmospheric pressure.
EASY
9th CBSE
IMPORTANT
Name the process associated with the following:
A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
EASY
9th CBSE
IMPORTANT
Name the process associated with the following:
A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.