English Medium Class 9 - CBSE Question Bank Solutions

What is a physical change ? Give two examples of physical changes.

What is a chemical change ? Give two examples of chemical changes.

Give the main differences between physical changes and chemical changes.

Which of the following are physical changes and which are chemical changes ?

Which of the following are physical changes and which are chemical changes ?

Freezing of water

Which of the following are physical changes and which are chemical changes ?

 Rusting of iron

Which of the following are physical changes and which are chemical changes ?

Glowing of an electric bulb

The rusting of an iron object is called :

Which of the following are physical changes ?

1. melting of iron metal
2. rusting of iron metal
3. bending of an iron rod
4. drawing a wire of iron metal

Which of the following are chemical changes ?

1. decaying of wood
2. burning of wood
3. sawing of wood
4. hammering of nail into wood

Lysosomes are also called digestive bags. Why?

One of the following elements has an atomicity of ‘one’. This element is :

If the aluminium salt of an anion X is Al2X3, what is the valency of X ? What will be the formula of the magnesium salt of X ?

What is a group of 6.022 × 10²³ particles known as ?

What name is given to the amount of substance containing 6.022 × 10²³ particles(atoms,molecules or ions) of a substance ?

How many moles are 3.6 g of water ?

What is the mass of 0.2 mole of oxygen atoms ?

Fill in the following blanks :

A mole represents an .............. number of particles of a substance.

Fill in the following blanks :

60 g of carbon element are .............. moles of carbon atoms.

Fill in the following blanks :

0.5 mole of calcium element has a mass of ............... .