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 sulpur 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.
$(a)$ $3 H _{2(g)}+ N _{2(g)} \longrightarrow 2 NH _{3(g)}$
$(b)$ $2 H _{2} S _{( g )}+3 O _{2( g )} \longrightarrow 2 H _{2} O _{(l)}+2 SO _{2( g )}$
$(c)$ $3BaC{{l}_{2(aq)}}+A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3(aq)}}$ $\to 2AlC{{l}_{3\left( aq \right)}}+3BaS{{O}_{4(s)}}$
$(d)$ $2 K _{(s)}+2 H _{2} O _{(l)} \longrightarrow 2 KOH _{(aq)}+ H _{2(g)}$
Balance the following chemical equations.
$(a)$ $HNO _{3}+ Ca ( OH )_{2} \longrightarrow Ca \left( NO _{3}\right)_{2}+ H _{2} O$
$(b)$ $NaOH + H _{2} SO _{4} \longrightarrow Na _{2} SO _{4}+ H _{2} O$
$(c)$ $NaCl + AgNO _{3} \longrightarrow AgCl + NaNO _{3}$
$(d)$ $BaCl _{2}+ H _{2} SO _{4} \longrightarrow BaSO _{4}+ HCl$
Write a balanced chemical equation with state symbols for the following reactions.
$(i)$ Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
$(ii)$ Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.
What is the difference between displacement and double displacement reactions ? Write equations for these reactions.
A solution of a substance $‘X’$ is used for whitewashing.
$(i)$ Name the substance $‘X’$ and write its formula.
$(ii)$ Write the reaction of the substance $‘X’$ named in $(i)$ above with water.
Explain the ''Corrosion'' terms with one example.