Question

Complete the following chemical reactions.
(i)\[PbS(s) + {H_2}{O_2}(aq) \to \]
(ii)\[MnO4{^ - }(aq) + H2O2(aq) \to \]
(iii)\[\;CaO(s) + {H_{2}}O(g) \to \]
(iv)\[AlC{l_3}(g) + {H_2}O(l) \to \]
(v)\[C{a_3}{N_2}(s) + {H_2}O(l) \to \]
Classify the below into (a) hydrolysis, (b) redox and (c) hydration reactions.

Answer 1

Hint: Hydrolysis is a chemical process in which a molecule of water is added to a substance.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species
A hydration reaction is a chemical reaction in which a substance combines with water.

Complete answer:
Balancing of a Chemical equation is based on the Principle of Atom Conservation (POAC) which states that the total number of atoms of each element in reactants must equal the number of atoms of that element in products. It is a derivation of the law of Mass Conservation.

(i)\[PbS(s) + 4{H_2}{O_2}(aq) \to PbS{O_4}(s) + 4{H_2}O(l)\]
The reaction is a redox reaction.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.
Here Lead sulphide is oxidized to lead sulphate and Hydrogen peroxide is reduced to water.

(ii)\[\;2Mn{O_4}^ - (aq) + 5{H_2}{O_2}(aq) + 6{H^ + } \to 2M{n^{2 + }}(aq) + 8{H_2}O(l) + 5{O_2}(g)\]
The reaction is a redox reaction.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species.
Here Permanganate is reduced to Manganese and hydrogen atoms are oxidized to oxygen.

(iii)\[CaO(s) + {H_2}O(g) \to Ca(O{H_2})(aq)\]
The reaction is a hydrolysis reaction.
Hydrolysis is a chemical process in which a molecule of water is added to a substance.
Here Calcium oxide combines with water to give calcium hydroxide.

(iv)\[AlC{l_3}(g) + 3{H_2}O(l) \to Al{(OH)_3}(s) + 3HCl(aq)\;\;\]
The reaction is a hydrolysis reaction.
Hydrolysis is a chemical process in which a molecule of water is added to a substance.
Aluminium chloride gets added with water to give Aluminium hydroxide

(v) \[C{a_3}{N_2}(s) + 6{H_2}O(l) \to 3Ca{(OH)_2}(aq) + 2N{H_{3}}(aq)\]
The reaction is a hydrolysis reaction.
Hydrolysis is a chemical process in which a molecule of water is added to a substance.
Calcium nitride combines with water to give calcium hydroxide.

Note:
Hydrolysis is a chemical process in which a molecule of water is added to a substance.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species
A hydration reaction is a chemical reaction in which a substance combines with water.