Q14E - Chemistry (OpenStax)

Question

Indicate what type or types of reaction each of the following represents:

(a) \({H_2}O\left( g \right) + C\left( s \right) \to CO\left( g \right) + {H_2}\left( g \right)\)

(b) \(2KCl{O_3}\left( s \right) \to 2KCl\left( s \right) + 3{O_2}\left( g \right)\)

(c) \(Al{\left( {OH} \right)_3}\left( {aq} \right) + 3HCl\left( {aq} \right) \to AlC{l_3}\left( {aq} \right) + 3{H_2}O\left( l \right)\)

(d) \(Pb\left( {N{O_3}} \right)\left( {aq} \right) + {H_2}S{O_4}\left( {aq} \right) \to PbS{O_4}\left( s \right) + 2HN{O_3}\left( {aq} \right)\)

Step-by-Step Solution

Answer

(a) Oxidation-reduction reaction

(b) Oxidation-reduction reaction

(c) Acid-base reaction

(d) Precipitation reaction.

Step 1: Oxidation–reduction reaction (a)

Carbon is oxidised from 0 to +2 state and hydrogen is reduced from +1 to 0 oxidation state.

Step 2: Oxidation–reduction reaction (b)

Here oxygen is oxidised from -2 to 0 oxidation state and chlorine is reduced from +5 to -1 oxidation state. The reaction is called decomposition reaction.

Step 3: Acid-base reaction (c)

Here the transfer of hydrogen and hydroxyl ions between reactants happens, leading to the formation of aluminium chloride and water.

Step 4: Precipitation reaction (d)

The ions replace and form an insoluble product, lead sulfate. Hence the reaction is called a double displacement reaction.