Electrochemistry test 5

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A test from chapter 5 i.e Circular of Physics part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. Oxidation number of oxygen in OF2 is

A) +1
B) -1
C) +2
D) -2

2. The e.m.f. of Zn – Cu cell is

A) 1.10 v
B) 1.5 v
C) 2.0 v
D) 2.5 v

3. The standard reduction potential of a standard hydrogen electrode

A) 0.0 v
B) 1.1 v
C) 1.5 v
D) 2.0 v

4. The oxidation number of Mn is K2 MnO4 is

A) +2
B) +4
C) +6
D) +7

5. Which of the following is the definition of oxidation

A) gain of electrons
B) loss of electrons
C) addition of H2
D) removal of O2

6. During electrolysis of H2SO4 (aq) O2 is evolved at

A) cathode
B) anode
C) both
D) none

7. The e.m.f. produced by a voltage cell is

A) electrode potential
B) reduction potential
C) cell potential
D) oxidation potential

8. Which of the following is not a redox reaction

A) CaCO3 ( CaO + CO2
B) Cu + 4HNO3 ( Cu(NO3)2 + 2NO2 + H2O
C) 2H2 + O2 ( 2H2O
D) MnO2 + 4HCl ( MnCl2 + Cl2 + 2H2O

9. Which element acts as a reducing agent in the reaction Zn + H2SO4 ( ZnSO4 + H2

A) zn
B) H
C) S
D) O

10. Which element acts as a oxidizing agent in the reaction MnO2 + 4HCl ( MnCl2 + Cl2 + 2H2O

A) Mn
B) O
C) H
D) Cl