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Question

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 reacts with water to give potassium hydroxide and hydrogen gas.


Solution

(a) Hydrogen gas combines with nitrogen to form ammonia.

$$H_2(g) + N_2(g) \rightarrow NH_3$$

The balanced equation for this reaction can be written as:

$$3H_2(g) + N_2(g) \rightarrow 2NH_3$$


(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

$$H_2S(g) + O_2(g) \rightarrow H_2O + SO_2$$

The balanced equation for this reaction can be written as:

$$2H_2S(g) + 3O_2(g) \rightarrow 2H_2O + 2SO_2$$


(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

$$BaCl_2 + Al_2(SO_4)_3 \rightarrow AlCl_3 + BaSO_4\downarrow$$

The balanced equation for this reaction can be written as:

$$3BaCl_2 + Al_2(SO_4)_3 \rightarrow 2AlCl_3 + 3BaSO_4\downarrow$$


(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

$$K + H_2O \rightarrow KOH + H_2$$

The balanced equation for this reaction can be written as:

$$2K + 2H_2O \rightarrow 2KOH + H_2$$

Science
NCERT
Standard X

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