Question

Match Column A with Column B: 

 

Hint:

Remember the acronym OIL RIG: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons).

Answer 1

Match the following:

From Column A, we identify the process involved in each reaction and then match it with the correct term in Column B.

(a) CuO + C → Cu + CO
In this reaction, copper oxide loses oxygen and gets converted into copper.
Removal of oxygen is called reduction.
So, (a) → 3.

(b) Al³⁺ + 3e^- → Al
Here, aluminium ion gains electrons to form aluminium metal.
Gain of electrons is called reduction.
So, (b) → 3.

(c) PbBr₂ → Pb²⁺ + 2Br^-
In this reaction, lead bromide splits into ions.
This process is called electrolytic dissociation.
So, (c) → 5.

(d) 2O^2- - 2e^- → O₂
Here, oxide ions lose electrons to form oxygen gas.
Loss of electrons is called oxidation.
So, (d) → 1.

(e) HCl → H⁺ + Cl^-
Hydrochloric acid breaks into hydrogen ions and chloride ions.
This is also electrolytic dissociation.
So, (e) → 5.

Final Matching:
(a) → 3
(b) → 3
(c) → 5
(d) → 1
(e) → 5

Answer in pair form:
(a) Reduction
(b) Reduction
(c) Electrolytic dissociation
(d) Oxidation
(e) Electrolytic dissociation

Quick Explanation:
Reduction means gain of electrons or removal of oxygen.
Oxidation means loss of electrons or addition of oxygen.
Electrolytic dissociation means splitting of a compound into ions.