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