The value of the heat of solution for a substance result form an interplay of

When zinc powder is heated with sodium hydroxide solution , the substances formed are

Electrolysis of aqueous solutions of which of the following substances results in only the decomposition of water ?

To a solution of a substance gradual addition of ammonium hydroxide result in a black precipitate which does not dissolve in excess of NH_(4)OH however when HCI is added to the original solution a white precipitate is formed .The solution containe

Which one of the following substances form a colloidal solution in water-

Heat of conversion of substance A to substance B is equal to (kJ)