Question

that substance.
EXCERCISE 6(D)
(a) oxidizing agent
1. Describe briefly the ionic concept of oxidation and
(b) substance oxidized
reduction. Give an equation to illustrate.
(c) reducing agent
2. Is it essential that oxidation and reduction must occur side
6. Divide the following redox reactions in
by side in a chemical reaction ? Explain.
reduction half reactions.
3. State, giving reasons, whether the substances printed in
() Zn + Pb2+ - ZAP
bold letters have been oxidised or reduced.
i Zn + Cu Zn Cu
(a) PbO + CO - Pb + CO,
(m) C1, + 2Br - Br, 201
(b) Mg + 2HCl → MgCl2 + H2
(e) H2S + Cl2 → 2 HCI + S
7. (a) Write the equation in the ionic form
(d) Cl2 + H2S → 2HCI + S
Cuso. (aq) + Fe (s) - FeSO. (a) - 0
State whether the following conversions are oxidation or
(b) Divide the above equation into atidan
reduction reactions.
reduction half reactions.
(a) PbO2 +502 - PESO
8. Give reasons:
(b) Cu2+ + 2e → Cu
(a) Hydrogen is collected by the downwand din
(c) K → K+ +
of water and not of air, even though it is
(d) 201 - 2e → CL
than air
(b) A candle brought near the mouth of a jar com
5. In the following reaction : A++ B + A + B+ Write half
hydrogen gas starts burning but is extinguished
reactions for this reaction and name :
pushed inside the jar.
(112)
​

Answer 1

Copper(II) has an oxidation state of +2; the elemental metal has an oxidation state of 0. Gain of electrons is a reduction reaction. In a redox reaction, the reactant that loses electrons (is oxidized) causes a reduction and is called a reducing agent. ... The half-reactions for Equation 1 are shown below.

Answer 2

3) a.reduced

b.oxidised

c.oxidised

d.reduced

4)a.oxidation

b.reduction

c.oxidation

d.reduction

8)a. Because it forms an exclusive mixture with air and therefore cannot be collected by downward displacement of air even though it is lighter than it.