The following statements are true under certain conditions. Mention condition in each case.
(i) Hydrogen reacts with nitrogen to form ammonia.
(ii) Hydrogen can be prepared from water at ordinary temperature.
(iii) A metal will liberate hydrogen by its reaction with dilute `H_(2)SO_(4)`

Which of the following liberate hydrogen on reaction with dilute H_2 SO_4 ?

Which of the following metal liberates hydrogen when treated with dilute H_2SO_4 ?

Each of the following statements is true only under some specific conditions. Write the condition for each sub-equation in not more than two sentences. (i) Metals can be recovered from their ores by chemical methods. (ii) High purity metals can be obtained by zone refining method.

Translate the following statements into chemical equations and then balance them. (i) Hydrogen gas combines with nitrogen to form ammonia. (ii) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (iii) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate. (iv) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

The following statement is true only under some specific conditions. Write the condition for questions in not more than two sentences. 2- Methyl propene can be converted into isobutyle bromide by hydrogen bromide.

Translate the following statements into chemical equations and then balance them: (a) Hydrogen gas combines with nitrogen to form ammonia. (b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate. (d) Potassium metal react with water to give potassium hydroxide and hydrogen gas.

Which of the following alkenes will react fastest with H_(2) under catalytic hydrogenation conditions