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. What is metallurgy ?

process of extracting metal in pure form from its ore.
process of creating alloys of metals.
process of making metals live long.
None of above.

Answer: Option A

2. A catalyst is a substance which

increases the activation energy
increases the rate of reaction and increases the equilibrium concentration of products
changes the equilibrium of a reaction so that the concentration of the product increases
hastens the attainment of equilibrium

Answer: Option D

3. What is a mixture of potassium nitrate powdered charcoal and sulphur called?

paint
aluminium
brass
gun powder

Answer: Option D

Explanation:

gun powder is the mixture of potassium nitrate powdered charcoal and sulphur.

4. Air contains maximum amount of

oxygen
nitrogen
hydrogen
carbon dioxide

Answer: Option B

5. Which is used in preparation of dynamite ?

glycerol
ethyl alcohol
methyl alcohol
glycol

Answer: Option A

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