FSC Chemistry MCQs Chapter 10 Class 11

Created on February 10, 2022

Chemistry Ch 10 Class 11 Electrochemistry

1 / 66

In Balancing redox equation, the first thing is to:

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) Balance out the atoms on each side

B) Write the skeleton Equation

C) Calculate the oxidation Number

D) Identify the elements and their states

2 / 66

The overall positive reduction potential value predicts that process is:

NUMS 2015
Chemistry
Electrochemistry
Elimination Tool:

A) Not feasible

B) Feasible

C) Impossible

D) No indication

3 / 66

Oxidation is defined as:

) loss of electron

Gain of electron

Gain of oxygen

Both a and c

4 / 66

The hydrogen gas bubbling into one molar solution of HCl has a pressure of

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) 2atm

B) 780 mmHg

C) 19 Psi

D) 1 atm

5 / 66

During oxidation process, oxidation number of an element:

PMC 2020
Chemistry
Electrochemistry
Elimination Tool:

A) Decreases

B) Increases

C) Remains constant

D) Both decreases and increases

6 / 66

Oxidation state of P in Mg2P3O5 Is

+2

-2

-1

1

7 / 66

When electricity is passed through water in the presence of an acid, oxygen and ______ is produced.

NTS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) Carbon

B) CO

C) CO2

D) Hydrogen

8 / 66

The Oxidation state of Alkali metals in any compound is?

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) 1

B) 2

C) 3

D) zero

9 / 66

In the following reaction:

3Br2 +6CO32- + 3H2O → 5Br-1 + BrO3-1 + 6HCO3-1

NTS 2014
Chemistry
Electrochemistry
Elimination Tool:

A) bromine is: reduced and water Is oxidized

B) bromine is both reduced and oxidized

C) bromine is oxidized and carbonate is reduced

D) bromine is neither reduced or oxidized

10 / 66

The reaction: Cl2 + H2O→ HCl + HOCl is an example of:

NTS 2014
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation reaction

B) Reduction reaction

C) Auto-oxidation and reduction reaction

D) Substitution reaction

11 / 66

Conversion of Electrical energy into chemical energy is

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

A) Mechanical Energy

B) Electromechanical Energy

C) Electrochemistry

D) Chemical Energy

12 / 66

Which of the methods to prevent corrosion?

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) Alloying two metals

B) Coating the surface with less reactive metal

C) Painting the surface with a dye

D) All

13 / 66

Which one among the following is the strongest reducing agent:

Fe2++ 2e -> Fe (-0.44V)

Sn2++ 2e -> Sn (-0.14 V)

Ni2++ 2e -> Ni (0.25 V)

Fe3++ e -> Fe2+(-0.77 V)

NUMS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) Fe3+

B) Ni

C) Fe2+

D) Sn

14 / 66

A solution of Sodium Sulphate was electrolyzed using platinum electrode, the products at the anode and cathode respectively are:

NUMS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) O2, H2

B) O2,Na

C) O2, SO

D) O2, S2O4-2

15 / 66

Oxidation state of sulphur in H2SO4?

+2

+6

4

-2

16 / 66

Both a and c What is the oxidation number of S in SO2^(-2)?

6

2

— 6

8

17 / 66

What is the oxidation state of Mn in K2MnO4?

12

8

7

6

18 / 66

Definition of electrode potential is?

Tendency of metals to form ions when dissolved in 1M solution of its own solution

Tendency of ions to form atoms when dissolved in 1M solution of its metal

Both a and b

None of these

19 / 66

Two half cells of a galvanic cell are connected with a salt bridge, the electrons flow from:

Anode to cathode through external circuit

Cathode to anode through external circuit

Anode to cathode through salt bridge

Cathode to anode through salt bridge

20 / 66

Standard reduction potential of F2, Br2 is:

+2.87, +1.08

+0.332, +2.87

-0.78, -1.66

None of the:

21 / 66

In which of the following nitrogen compounds, does N has the highest oxidation state?

NTS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) NH2OH

B) N2H4

C) HNO3

D) NH3

22 / 66

Which of the following statements about the reaction given below are correct.

IO3-(aq) + 2I-(aq) + 6H+(aq) + 6Cl-(aq) -> 3ICl2-(aq) + 3H2O(l)

NUMS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) The oxidation number of iodine in the iodate ion,IO3-(aq), changes from +5 to +1

B) The oxidation number of iodine in the iodide ion I-, changes from -1 to +2

C) The oxidation number of chlorine in the iodide ion I- , changes from -1 to -2

D) Iodate ions are oxidized

23 / 66

Current in electrolysis is carried through?

PMC Practice 1
Chemistry
Electrochemistry
Elimination Tool:

A) Free electrons

B) Positive Ions

C) Negative Ions

D) Both B and C

24 / 66

In the electrolysis of molten ZnCl2, how much Zn can be deposited at the cathode by the passage of 0.01 ampere for one hour?

NUMS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) 0.002 g

B) 0.123 g

C) 0.012 g

D) 0.004 g

25 / 66

The process in which electric current is used to carry out a non-spontaneous redox reaction is called:

NUMS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) Electrolyte

B) Metallic conductor

C) Electrolysis

D) None of the above

26 / 66

Each half reaction in ion electron method is balanced by adding:

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

A) Electrons on left hand side

B) Electrons on right hand side

C) Both left or right hand side

D) None of these options are correct

27 / 66

In Lead-Acid battery, product formed at anode during discharging is

PbSO4

Pb

SO2

SO4

28 / 66

Oxidation number of Nitrogen in HNO3, is:

NTS 2011
Chemistry
Electrochemistry
Elimination Tool:

A) +4

B) +2

C) +6

D) +5

29 / 66

If we balanced the following reaction , what is the net ionic charge on the right side of the equation?
__H+ +___ MnO4- + ____ Fe2+ →___ Mn2+ + ___ Fe3+ + ___ H2O

NTS 2014
Chemistry
Electrochemistry
Elimination Tool:

A) +5

B) +7

C) +10

D) +17

30 / 66

Which of the following exhibits an oxidation state of -3?

P

0

CI

Na

31 / 66

Which one has valency other than one?

Mn in KMnO4

K in KCL

Br in Br2O

Na in NaCI

32 / 66

CH3Cl + Cl2 —-> CH2Cl2 + HCl is an example of ?

NTS 2015 SMBBMC
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation reduction

B) Addition reaction

C) Substitution reaction

D) Autoxidation reaction

33 / 66

The oxidation state of “S’ in the (S2O3)-2 is:

PMC 2020
Chemistry
Electrochemistry
Elimination Tool:

A) +4

B) +6

C) -2

D) +2

34 / 66

In the reaction 2Fe+Cl2 2FeCl3

NTS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) Fe is reduced

B) Fe is oxidized

C) Cl2 oxidized

D) None of the above

35 / 66

In electrochemical series, elements are arranged in order of their standard electrode potentials, the correct decreasing reactivity order for metals is:

NTS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) Gold, silver, magnesium, aluminum

B) Mercury, calcium, sodium, magnesium

C) Sodium, aluminum, lead, copper

D) Potassium, silver, magnesium, aluminum

36 / 66

which one of the following Is the oxidation number of Iodine in I2?

0

1

2

None

37 / 66

+3 and +5 oxidation states are often shown by:

Cl

F

Zn

Cu

38 / 66

Hydrolysis means reaction with

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) Oxygen

B) Hydrogen

C) Water

D) Air

39 / 66

Highest oxidation state of chlorine Is

+7

-7

+1

−1

40 / 66

The oxidation state of carbon in C2O42- is:

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

A) +4

B) -4

C) +3

D) +2

41 / 66

Decrease in Oxidation number is

PMC Sample 2
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation

B) Reduction

C) Both A and B

D) None of these

42 / 66

The process of depositing a thin layer of expensive metals on ordinary or expensive metals is called:

NUMS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) Electroplating

B) Conductivity

C) Galvanizing

D) Metallurgy

43 / 66

The process in which electric current is used to carry out a non-spontaneous redox reaction is called:

NTS 2017
Chemistry
Electrochemistry
Elimination Tool:

A) Electrolyte

B) Electrolysis

C) Metallic conductor

D) None of the above

44 / 66

Which of the following is a balanced redox equation?

NUMS 2020
Chemistry
Electrochemistry
Elimination Tool:

A) Na + Fe 3+ -> Na + + Fe

B) Zn + Ag + -> Zn 2+ + Ag

C) 3Na + Fe3+ -> 3Na+ + Fe

D) 2Zn + Ag+ -> 2Zn2+ + Ag

45 / 66

The oxidation number of Br in Br2 is:

NTS 2019
Chemistry
Electrochemistry
Elimination Tool:

A) -1

B) -2

C) 0

D) +1

46 / 66

X is a salt that decomposes in water.

What is the reason for its decomposition?
e-+ X3+→ X2+ Ecell= 1.91 V

NUMS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) This potential oxidizes salt

B) This potential reduces salt

C) This potential reduces water

D) This potential oxidizes water

47 / 66

The E.M.F of a Cell is equals to

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

A) Emf(oxidation) – Emf(Reduction)

B) Emf(oxidation) + Emf(Reduction)

C) Emf(oxidation) x Emf(Reduction)

D) None of these

48 / 66

The common oxidation number of halogens is:

PMC 2020
Chemistry
Electrochemistry
Elimination Tool:

A) -1

B) +1

C) -2

D) 0

49 / 66

Zn can be deposited on iron by?

Galvanizing

Cathode Coating

Neutral suspension

All of these

50 / 66

The electrolyte used in fuel cell is:

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

A) KOH

B) NaCl (aq)

C) NaNO3

D) Molten NaCl

51 / 66

Oxidation number of Cr in K2Cr2O2 & K2Cr2O4 is:

+6, +3

+5, +2

7 +3

6 +4

52 / 66

Stronger the oxidizing agent, higher is the:

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

A) Emf of cell

B) Oxidation potential

C) Reduction potential

D) Redox potential

53 / 66

Conversion of Electrical energy into chemical energy is

PMC Sample 2
Chemistry
Electrochemistry
Elimination Tool:

A) Mechanical Energy

B) Electromechanical Energy

C) Electrochemistry

D) Chemical Energy

54 / 66

Current in electrolysis is carried through:

PMC Sample 3
Chemistry
Electrochemistry
Elimination Tool:

A) Free electrons

B) Positive Ions

C) Negative Ions

D) Both B and C

55 / 66

If we move down the electrochemical series:

NUMS 2014
Chemistry
Electrochemistry
Elimination Tool:

A) Reduction potential will increase

B) Reduction potential will decrease

C) Oxidizing ability increase

D) None of them

56 / 66

What is the cell reaction of

Zn(s) | Zn2+(aq) 1M | Ni2+(aq) 1M | Ni(s)

Zn2+(aq) + 2e- -> Zn(s), Eo = -0.76 V

Ni2+(aq) + 2e- -> Ni(s), Eo = -0.25 V

NUMS 2019 Cancelled
Chemistry
Electrochemistry
Elimination Tool:

A) Ni2++ Zn -> Zn2++ Ni

B) Zn2++ Ni -> Ni2++ Zn

C) Zn2++ Ni2+-> Zn + Ni

D) Zn + Ni -> Zn2++ Ni2+

57 / 66

Stronger the oxidizing agent, greater is the:

NUMS 2020
Chemistry
Electrochemistry
Elimination Tool:

A) Oxidation potential

B) Reduction potential

C) Redox potential

D) EMF of cell

58 / 66

On balancing the following chemical equation: K2CrO4, + HCI –> KCI + 2CrCI3 + Cl2 + H2O The co-efficient with HCI will be?

12

14

13

16

59 / 66

Which of the following metals does NOT liberate hydrogen in reaction with acids?

NUMS 2019 Reconduct
Chemistry
Electrochemistry
Elimination Tool:

A) Mg

B) Pt

C) Zn

D) Ca

60 / 66

The oxidation potential standard hydrogen electrode is arbitrarily taken as:

NTS 2019
Chemistry
Electrochemistry
Elimination Tool:

A) -0.76 volts

B) 0.00 vols

C) +1.5 volts

D) 1.0 vots

61 / 66

Only those substances are written in Ion Electron Method:

PMC Sample 1
Chemistry
Electrochemistry
Elimination Tool:

A) Which are oxidizing

B) Which are reducing

C) Which are not taking part in reaction

D) Which will take part in reaction

62 / 66

The breakdown of a substance with current is:

NUMS 2020
Chemistry
Electrochemistry
Elimination Tool:

A) Thermolysis

B) Catalysis

C) Electrolysis

D) Photolysis

63 / 66

Standard Electrode Potential is measured at temperature:

348K

298K

20K

235K

64 / 66

The oxidation number of nitrogen in the HNO3 is _______.

NUMS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) 4+

B) 5+

C) 6+

D) 7+

65 / 66

The oxidation number of all the elements in the free state is:

NTS 2012
Chemistry
Electrochemistry
Elimination Tool:

A) 1

B) 3

C) 0

D)-1

66 / 66

Oxidation number of particular element can be directly or indirectly inferred from its:

UHS 2019
Chemistry
Electrochemistry
Elimination Tool:

A) Group number

B) Atomic size

C) Atomic mass

D) Physical state

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