Elements And Metals : 2

Question 6 :

Potassium nitrate is used in

A). medicine
B). fertiliser
C). salt
D). glass
Answer : Option B

Question 7 :

Permanent hardness of water may be removed by the addition of

A). sodium carbonate
B). alum
C). potassium permanganate
D). lime
Answer : Option A

Question 8 :

Soda water contains

A). carbonic acid
B). sulphuric acid
C). carbon dioxide
D). nitrous acid
Answer : Option C

Question 9 :

The most important ore of aluminium is

A). galena
B). calamine
C). calcite
D). bauxite
Answer : Option D

Explanation :

Bauxite is an aluminium ore and is the main source of aluminium.

Question 10 :

Most soluble in water is

A). camphor
B). sulphur
C). common salt
D). sugar
Answer : Option D