How will you distinguish among sodium chloride, potassium chloride and calcium chloride ?

Q. How would you distinguish between the following set of compounds?
zinc chloride and calcium chloride

Q. Using sodium hydroxide solution, how will you distinguish:
(a) zinc nitrate solution from calcium nitrate solution?
(b) iron (II) chloride from iron (III) chloride?
(c) lead hydroxide from magnesium hydroxide?

Q. Using sodium hydroxide solution, how would you distinguish:
(a) Ammonium sulphate from sodium sulphate.
(b) Zinc nitrate solution from calcium nitrate solution.
(c) Iron (II) chloride from Iron (III) chloride.

Q. Using Sodium hydroxide solution, how would you distinguish : Iron (II) chloride from Iron (III) chloride?

Q. In the neighbourhood of your school, hard water required for an experiment is not available. Select from the following groups of salts available in your school, a group each member of which, if dissolved in distilled water will make it hard :

(a) Sodium chloride, calcium chloride

(b) Potassium chloride, sodium chloride

(c) Sodium chloride, magnesium chloride

(d) Calcium chloride, magnesium chloride