English Medium इयत्ता ९ - CBSE Question Bank Solutions for Science

Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air

Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air

What is the other name for impure substances ? Give two examples of impure substances.

What is the other name for impure substances ? Give two examples of impure substances.

Which of the following substances are elements ?

Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

Which of the following substances are elements ?

Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

Name two solid, two liquid and two gaseous elements at the room temperature.

Name two solid, two liquid and two gaseous elements at the room temperature.

Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.

Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.

What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.

What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.

State two physical properties on the basis of which metals can be distinguished from non-metals.

State two physical properties on the basis of which metals can be distinguished from non-metals.

State any two properties for believing that aluminium is a metal.

State any two properties for believing that aluminium is a metal.

Give reason why copper metal is used for making electric wires.

Give reason why copper metal is used for making electric wires.

Give reason why graphite is used for making elecrode in a dry cell.

Give reason why graphite is used for making elecrode in a dry cell.