English Medium इयत्ता ९ - CBSE Question Bank Solutions

Organelle other than nucleus, containing DNA is

Kitchen of the cell is

Classify the following as chemical or physical change: 

Cutting of trees

Classify the following as chemical or physical change: 

Melting of butter in a pan

Classify the following as chemical or physical change: 

Rusting of almirah

Classify the following as chemical or physical change:

Boiling of water to form steam.

Classify the following as chemical or physical change:

Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.

Classify the following as chemical or physical change: 

Dissolving common salt in water.

Classify the following as chemical or physical change:

Making a fruit salad with raw fruits

Classify the following as chemical or physical change:

Burning of paper and wood

Try segregating the things around you as pure substances or mixtures.

Explain the following giving an example.

Pure substance

Which of the following are chemical changes?

1. Growth of a plant
2. Rusting of iron
3. Mixing of iron fillings and sand
4. Cooking of food
5. Digestion of food
6. Freezing of water
7. Burning of candle

If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon?

Which has more number of atoms, 100 grams of sodium or 100 grams of iron (given, atomic mass of Na = 23 u, Fe = 56 u)?

Calculate the molar mass of the following substance: 

Ethyne, C₂H₂

Calculate the molar mass of the following substance: 

Phosphorus molecule, P₄ (atomic mass of phosphorus = 31)

Calculate the molar mass of the following substance: 

Sulphur molecule, S₈

Calculate the molar mass of the following substance: 

Hydrochloric acid, HCl

Calculate the molar mass of the following substance: 

Nitric acid, HNO₃