In our daily lives, we encounter a wide range of reactions. We’ve noticed that when an apple is cut with a knife and left for a while, it turns brown. It is because the iron in it oxidises in the presence of air. Another example of oxidation is rusting. Some reactions have both oxidation and reduction reactions going on at the same time. These are known as redox reactions.
Download Class 11 Chemistry Worksheet on Chapter 8 Redox Reactions Set 2 PDF.
CBSE Class 11 Chemistry Chapter 8 Redox Reactions – Set 2
Q-1: In the subsequent reaction, K + O2 → KO2, the oxidation state of oxygen is altered from _________.
a) 0 to -1
b) 0 to -2
c) 0 to -½
d) 0 to +1
Q-2: Which substance never exhibits a negative oxidation number?
a) O
b) Fe
c) S
d) F
Q-3: Which statement regarding the salt bridge is accurate?
a) It completes the circuit
b) It maintains neutrality
c) It contains salt
d) All of the above
Q-4: An electrochemical cell has two half cell reactions as,
B2+ + 2e– → B ; E0 = 0.34 V
Y → Y2+ + 2e– ; E0 = 2.37 V
The cell voltage will be
a) 2.71 V
b) 2.03 V
c) -2.71 V
d) -2.03 V
Q-5: Which of the following is the most reactive metal?
a) K
b) Zn
c) Ni
d) Ag
Q-6: How does sulphur show a disproportionation reaction? Give an example.
Q-7: Chloride and chlorate ions are produced when chlorine gas is passed through a concentrated alkali solution. Identify the reaction and obtain a balanced chemical equation for it.
Q-8: Give a classical definition of oxidation along with some suitable examples.
Q-9: Write the anodic and cathodic reactions for the galvanic cell after taking into account the following reactions.
i) 2Fe3+(aq) + 2Cl–(aq) → 2Fe2+(aq) + Cl2(g)
ii) 2Cr(s) + 3Cu2+ → 3Cu(s) + 2Cr3+
Q-10: The reduction potentials of the following reactions are:
Cl2 + 2e– → 2Cl–; Eo= 1.36 V
F2 + 2e– → 2F–; Eo= 2.87 V
Which is a better oxidising agent?
Q-11: Show that the following process is a redox one.
3CuO + 2NH3 → 3Cu + N2 + 3H2O
Q-12: What is the element’s oxidation number in each of the following species?
a) KI3
b) CO32-
c) NH3
d) HClO
e) HPO42-
Q-13: Give an example of a compound in which the oxidation number is fractional.
Q-14: Balance the equation by ion electron method.
Zn + NO3– → Zn2+.+ NH4+ (in basic medium)
Q-15: What do you mean by non-metal displacement reactions? Explain with an example.
Q-16: Explain the combination reaction.
Q-17: What is the electrochemical series? Write two applications for it.
Q-18: Write formulas for the following compounds.
a) Mercury (II) chloride
b) Tin (IV) oxide
c) Iron (III) sulphate
d) Chromium (III) oxide
Q-19: Arrange the following metals in the order in which they displace each other from the solutions of their salt.
Ca, Pb, Sn, H, Fe, Ni
Q-20: Predict whether the reaction between the following is feasible.
a) Ag(s) + Fe3+ (aq)
b) Br2(aq) + Fe2+(aq)
c) Fe3+(aq) + I–(aq)
Download the PDF to access answers to the Chemistry Worksheet for Class 11 Chemistry Chapter 8 Redox Reactions Set – 2.
