Electrochemistry

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Electrochemistry

Test1 Max. Marks = 40

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1. How many kJ of energy is spent when a current of 4 amp passes for 200 second under a potential of 115 V ?

4 points

(A) 52 kJ

(B) 72 kJ

(D) 92 kJ

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2. Calculate molar conductivity at infinite dilution of CH₃COOH if molar conductivity at infinite dilution of CH₃COONa, HCl and NaCl are 91.6, 425.0 and 128.1 S cm² mol⁻¹ -

4 points

(A) 390.5 S cm² mol⁻¹

(B) 388.5 S cm² mol⁻¹

(D) None of these

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1. Which of the following does not occur at cathode of electrolytic cell ?

4 points

(A) Ag⁺ ------> Ag - e–

(B) Fe⁺³ + e– ------> Fe⁺²

(D) Cu ------> Cu⁺² + 2e-

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4.The half cell reduction potential of a hydrogen electrode at pH = 10 will be

4 points

(A) – 0.59 V

(B) 0.59 V

(D) – 0.059 V

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5. Which of the following solution can be safely stored in a copper vessel ?

4 points

(A) AuCl₃

(B) AgNO₃

(D) All of these

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6.The electric charge for electrode deposition of one gram equivalent of a substance is-

4 points

(A) one ampere per second

(B) 96,500 coulombs per second

(D) charge on one mole of electrons

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7.In an electrolytic cell, which of the following facts is not true ?

4 points

(A) Cathode is negative terminal

(B) Cathode is positive terminal

(D) Electrons enter into cathode from the external cell

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8. A current of strength 2.5amp was passed through CuSO₄ solution for 6 minute 265 seconds. The amount of copper deposited is
(At wt. of Cu = 63.5); 1 faraday = 96500 coulombs

4 points

(A) 0.3175 g

(B) 1.028 g

(D) 6.35 g

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9. Which of the following would occur when lead storage cell is charged ?

4 points

(A) sulphuric acid is consumed

(B) sulphuric acid is formed

(D) lead is consumed

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10. 3 faraday of electricity are passed through molten Al₂O₃, aqueous solution of CuSO₄ and molten NaCl taken in three different electrolytic cells. The amount of Al, Cu and Na deposited at the cathodes will be in the ratio of

4 points

(A) 1 mole : 2 mole : 3 mole

(B) 3 mole : 2 mole : 1 mole

(D) 1.5 mole : 2 mole : 3 mole

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