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. Biogas majorly contains ?

Ethane
Methane
Hydrogen
CO

Answer: Option B

2. Human bone does not contain

calcium
carbon
oxygen
phosphorous

Answer: Option C

Explanation:

Human bone contains calcium, carbon, phosphorous.

3. Which of the following gas is used in cigarette lighters ?

Butane
Propane
Methane
Ethane

Answer: Option A

4. Rare gases are

mono atomic
di atomic
tri atomic
None of above

Answer: Option A

Explanation:

Rare gases are mono atomic.

5. pH of blood is ?

10.4
9
7.4
4

Answer: Option C

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