Question

Which of the following is a true solution?
(a) CaCl, in water
(b) Ca(OH), in water
(c) Glucose in water
(d) MgO in water
2. Which one is hygroscopic?
(a) Sodium carbonate
(b) Sulphuric acid
(c) Calcium oxide
(d) Ferrous sulphate
3. Temporary hardness of water is caused by:
(a) calcium and magnesium chloride (b) calcium and magnesium bicarbonate
(c) calcium and magnesium sulphate (d) all of these
4. A saturated solution on heating:
(a) becomes unsaturated
(b) gives crystals of the solute
(c) becomes supersaturated
(d) decomposes
5. Which of the following reacts with only steam?
(a) Calcium
(d) Iron
(b) Magnesium (c) Copper​

Answer 1

Answer:

1. (d) MgO in water .

2.(c) calcium oxide.

3.(b) calcium and magnesium bicarbonate.

4.(b) gives crystals of the solute.

5.(a) Calcium.