A solution turns red litmus blue; its pH is likely to be?

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(a) The temperature of the solution increases

(b) The temperature of the solution decreases

(c) The temperatures of the solution remains the same

(d) Salt formation takes place

Which of the following salts does not contain water of crystallisation?

Why does an aqueous solution of an acid conduct electricity?

Name the sodium compound which is used for softening hard water.

A compound 'x' on losing partial crystallisation of water gives compound 'y' crystallisation of water gives compound 'y' which is used for making chalk and other pottery articles.  But when 'x' is strongly heated, it given 'z' which is used as drying agent, Identify x, y, z and write chemical equations.

A liquid has a pH less than 7 which represent all acidic solution:
(i) State the nature of the solution, if its pH increases from 7 to 14.
(ii) Mention the ion whose concentration increases with the increase in pH value.
(iii) Suggest a method that is generally used for measuring the pH value.

Illustrate any three chemical properties of acids with examples.

Sugandha prepares HCI gas in her school laboratory using certain chemicals. She puts both dry and wet blue litmus papers in contact with the gas.
(i) Name the reagents used by Sugandha to prepare HCl gas.
(ii) State the colour changes observed with the dry and wet blue litmus paper.
(iii) Show the formation of ions when HCl gas combines with water

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back.  On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y; it gives a compound Z, used for disinfecting drinking water.  Identity X, Y, G and Z.

Account for the following:
(i) State the relation between hydrogen ion concentration of an aqueous solution and its pH.
(ii) An aqueous solution has a pH value of 7.0. Is this solution acidic, basic or neutral?
(iii) Which has a higher pH value, 1MHCl or 1MNaOH solution?
(iv) Tooth enamel is one of the hardest substances in our body. How does it undergo damage due to eating chocolates and sweets? What should we do to prevent it?
(v)How do [H⁺] ions exist in water?