Question Detail

Permanent hardness of water is due to the presence of ?

Magnesium bicarbonate
Calcium bicarbonate
Sodium bicarbonate
Calcium sulphate

Answer: Option D

Similar Questions :

1. Oxides of metals are alkaline.

TRUE
FALSE

Answer: Option A

2. Which one of the following is the softest?

sodium
iron
aluminium
lithium

Answer: Option A

3. What nucleus of atom contains ?

protons
electrons
electrons and protons
protons and neutrons

Answer: Option D

4. Mass number of a nucleus is :

the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight
always less than its atomic number
None of above

Answer: Option A

5. The major component used in preparation of different types of glasses is :

Sodium borate
Sodium silicate
Silica
Calcium silicate

Answer: Option C

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