Give an example of a double displacement reaction other than the one given in the image.

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

$Fe_{2}O_{3} + 2Al \rightarrow Al_{2}O_{3} + 2Fe$
The above reaction is an example of a:

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.

Explain the "Reduction" in terms of gain or loss of oxygen with two examples.

What do you mean by a precipitation reaction? Explain by giving examples.