Give one example each of a salt which gives an aqueous solution having

(a) pH less than 7

(b) pH equal to 7

(c) pH more than 7

When the concentrated aqueous solution of substance X is electrolyzed, then NaOH, CI₂ and H₂ are produced.

Name the substance X. What is the special name of this process?

Consider the following substances:

NaCI, Ca(OH)₂, NaHCO₃, NH₃, Na₂CO₃, H₂O, Cl₂, CO₂, CaSO₄.2H₂O, 2CaSO₄.H₂O, 2CaSO₄.2H₂O, CaOCI₂

(a) Which two substances combine to form bleaching powder?

(b) Which four substances are utilized in the production of washing soda? (c)Which compound represents plaster of Paris?

(d) Which compound is a part of baking powder?

(e) Which compound is used as an antacid?

A compound X which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water.

(a) Identify the compound X

(b) Write the chemical equation for its preparation

(c) For what purpose is it used in hospitals?

Consider the following salts:

Na₂CO₃, NaCI, NH₄CI, CH₃COONa, K₂SO₄, (NH₄)zSO₄

Which of these salts will give:

(a) acidic solutions?

(b) neutralsolutions?

(c) basic solutions (or alkaline solutions)?