Electrochemistry

JEE Main 2024 (Online) 29th January Evening ShiftNumericalMedium📈 Topic in 15% papers+4

Ques. 1JEE Main 2024, 29 January (Evening Shift)

A constant current was passed through a solution of AuCl4- ion between gold electrodes. After a period of 10.0 minutes, the increase in mass of cathode was 1.314 g. The total charge passed through the solution is 10-2 F. (Given atomic mass of Au = 197)

Answer

Solution

In AuCl4-, Au is +3 ⇒ Au3+ + 3e- Au

Moles of Au deposited = 1.314197 = 6.67 10-3 mol

∴ Charge = 3 × 6.67 10-3 F = 2 10-2 F

(The time, 10.0 min, is not needed.)

Answer: 2

Keep practising — Electrochemistry

Ques. 2JEE Main 2024, 27 January (Morning Shift)

The mass of silver (Molar mass of Ag : 108 g mol-1) displaced by a quantity of electricity which displaces 5600 mL of O2 at S.T.P. will be g.

Ques. 3JEE Main 2024, 27 January (Evening Shift)

Which of the following statements is not correct about rusting of iron?

Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.
Dissolved acidic oxides SO2, NO2 in water act as catalyst in the process of rusting.
Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.
When pH lies above 9 or 10, rusting of iron does not take place.

Ques. 4JEE Main 2024, 27 January (Evening Shift)

The hydrogen electrode is dipped in a solution of pH = 3 at 25 . The potential of the electrode will be − 10-2 V. ( 2.303RTF = 0.059 V )

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