A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:

Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:

A salt whose aqueous solution will have a pH of more than 7 will be:

Which of the following salts will give an aqueous solution having pH of almost 7?

P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:

(a) blue litmus red?

(b) red litmus blue?