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Electrochemistry JEE

The Quiz is a JEE mains Level quiz containing 25 questions.

In 25 questions 15 questions are single choice, 6 questions are Assertion reasons type, 04 questions are Match the following type,

The time allotted for the quiz is 60 minutes.

The number of attempts remaining is 3

1 / 25

1. Select the correct statement for the weak electrolyte:

a) Λ_m increases steeply on dilution near high concentration.

b) The change in Λ_m with dilution is due to decrease in the degree of dissociation and number of ions in the solution that contain electrolyte.

c) They have higher degree of dissociation at higher concentration.

d) At infinite dilution, electrolyte dissociate completely but at such low concentration the conductivity of solution is low and cannot be measured accurately.

2 / 25

2. When 0.1 mole of MnO₄²^-is oxidized, the quantity of electricity required to completely oxidize MnO₄ ²^-to MnO₄^-1is:

a) 9650 C

b) 96500 C

c) 96.50 C

d) 2 x96500 C

3 / 25

3. Match the following Column I with type of electrolyte in Column II and choose the correct option from the codes given below.

Electro46

a) A →3; B → 1; C → 2

b) A →3; B → 2; C → 1

c) A →1; B → 2; C → 3

d) A →1; B → 3; C → 2

4 / 25

4. Match the items of Column I and Column II.

electro53

a) A →4; B → 3; C → 5; D → 2

b) A →1; B → 4; C → 3; D → 2

c) A →4; B → 3; C → 5; D → 1

d) A →3; B → 4; C → 5; D → 1

5 / 25

5. Statement I: The electrode may be negatively charged or positively charged, with respect to solution.
Statement II: Metal atom of electrode has tendency to go into solution as ion and leave behind the electron at the electrode.

a) Statement I is false, Statement II is true.

b) Statement I is true, Statement II is false.

c) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

d) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

6 / 25

6. Match the items of Column I and Column II.

elecro51

a) A →3; B → 4; C → 2; D → 1

b) A →4; B → 3; C → 1; D → 2

c) A →4; B → 3; C → 2; D → 1

d) A →3; B → 4; C → 1; D → 2

7 / 25

7. Two electrolytes X and Y are diluted. Λ _mof Y increases 1.5 times and for X it increases 25 times. Predict the strong electrolyte among X and Y.

a) There is no effect of dilution on nature of electrolyte

b) Both X and Y

c) X

d) Y

8 / 25

8. Consider the following graph.

electro15

Here the limiting molar conductivity is:

a) 147

b) 87.46

c) 148.6

d) 150

9 / 25

9. Match the following Column I (expressions) with Column II and choose the correct option from the codes given below.

Electro45

a) A →4; B → 3; C → 1; D → 2

b) A →3; B → 2; C → 4; D → 1

c) A →4; B → 1; C → 3; D → 2

d) A →3; B → 4; C → 2; D → 1

10 / 25

10. As a lead storage battery is charged:

a) The concentration of sulphuric acid decreases.

b) Lead dioxide dissolves

c) Lead electrode becomes coated with lead sulphate

d) Sulphuric acid is regenerated

11 / 25

11. Statement I: Solid NaCl does not conduct electricity.
Statement II: Solid NaCl has no free ions.

a) Statement I is false, Statement II is true.

b) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

c) Statement I is true, Statement II is false.

d) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

12 / 25

12. The graph of molar conductivity versus √C is plotted.

electro14

Which type of electrolyte are used in A and B ?

a) A→ Weak electrolyte; B→ Strong electrolyte

b) A→ Strong electrolyte; B→ Strong electrolyte

c) A→ Strong electrolyte; B→ Weak electrolyte

d) A→ Weak electrolyte; B→ Weak electrolyte

13 / 25

13. Statement I: DC cannot be used during measurement of resistance of an ionic solution.
Statement II: DC changes the composition of solution and solution cannot be connected to the bridge like metallic wire.

a) Statement I is false, Statement II is true.

b) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

c) Statement I is true, Statement II is false.

d) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

14 / 25

14. Conductivity (Unit Siemen's 'S') is directly proportional to area of the vessel and the concentration of the solution in it and is inversely proportional to the length of the vessel, then the unit of constant of proportionality is:

a) S² m² mol^-2

b) S m mol^-1

c) S m² mol^-1

d) S^-2 m² mol

15 / 25

15. Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because:

a) In electrochemical series, Zn is above hydrogen.

b) NO₃^-1 is reduced in preference to hydronium ion.

c) HNO₃ is weaker acid than H₂SO₄ and HCl

d) Zn acts as oxidizing agent when reacts with HNO₃.

16 / 25

16. When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are:

a) Cathode → Pure copper; Anode → Impure sample

b) Cathode → Impure sample; Anode → Pure copper

c) Cathode → Impure zinc; Anode → Impure sample

d) Cathode → Pure zinc; Anode → Pure copper

17 / 25

17. In electrolysis of NaCl when Pt electrode is taken then H₂ is liberated at cathode while with Hg cathode it forms sodium amalgam:

a) Hg is more inert than Pt.

b) More voltage is required to reduce at Hg than at Pt.

c) Concentration ofF ions is larger when Pt electrode is taken.

d) Na is dissolved in Hg while it does not dissolve in Pt.

18 / 25

18. Statement I: Pure water conducts electricity.
Statement II: It is unionized.

a) Statement I is true, Statement II is false.

b) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

c) Statement I is false, Statement II is true.

d) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

19 / 25

19. Statement I: Electrical conductance through metals is called electronic conductance.
Statement II: This is due to movement of electrons.

a) Statement I is true, Statement II is false.

b) Statement I is false, Statement II is true.

c) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

d) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

20 / 25

20. Select the correct statement

a) Conductivity decreases but molar conductivity increases with increase in concentration.

b) Conductivity decreases but molar conductivity increases with increase in dilution.

c) Conductivity as well as molar conductivity decrease with decrease in concentration.

d) Conductivity increases but molar conductivity decreases with increase in dilution.

21 / 25

21. Resistance of 0.2 M solution of an electrolyte is 50Ω. The specific conductance of the solution is 1.3 S m ^-1. If resistance of the 0.4 M solution of the same electrolyte is 260 Ω, its molar conductivity is :

a) 62.5 S m² mol^-1

b) 6.25 x 10^-4 S m² mol^-1

c) 6250 S m² mol^-1

d) 625 x 10^-4 S m² mol^-1

22 / 25

22. Standard electrode potential of three metals X, Y and Z are - + 1 2. V, 0. 5V and -30. V respectively. The reducing power of these metals will be:

a) X> Y > Z

b) Y > X > Z

c) Z > X > Y

d) Y >Z > X

23 / 25

23. Statement I: Platinum and gold are used as inert electrodes.
Statement II: Pt and Au do not participate in the reaction and provide the surface for oxidation or reduction.

a) Statement I is true, Statement II is true; Statement II is NOT a correct explanation for statement-I.

b) Statement I is true, Statement II is false.

c) Statement I is false, Statement II is true.

d) Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I.

24 / 25

24. Molar conductivities (Λ^°_m) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol^-1respectively. Λ^°_mfor CH₃COOH will be

a) 390.5 S cm² mol^-1

b) 425.5 S cm² mol^-1

c) 290.85 S cm² mol^-1

d) 180.5 S cm² mol^-1

25 / 25

25. Compound XA XB XC, are added into separate test tubes containing A, B, C solutions. XB react with A and C. XA does not react with any of these. XC reacts with A. Arrange the anion in the decreasing order of their oxidation.

a) A^-, B^-, C^-

b) C^-, A^-, B^-

c) B^-, A^-, C^-

d) B^-, C^-, A^-

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