Molten CuCl₂ is electrolysed using platinum electrodes. The reaction occurring at anode is

• 2Cl^- → Cl₂ (g) + 2e^-

• Cl₂(g) + 2e^- → 2Cl

• Cu²⁺ + 2e^- → Cu (s)

• Cu(s) → Cu²⁺ + 2e^-

During the electrolysis of cryolite, aluminium and fluorine are formed in ...... molar ratio :

• 1:2

• 2:3

• 1:1

• 1:3

What is the reduction electrode potential (in volts) of copper electrode when [Cu²⁺] = 0.01 M is in a solution at 25°C?

(E° of Cu²⁺/ Cu electrode is + 0.34 V)

• 0.3991

• 0.2809

• 0.3105

• 0.3695

The product obtained at anode when 50% H₂SO₄ aqueous solution is electrolysed using platinum electrodes is :

• H₂SO₃

• H₂S₂O₈

• O₂

• H₂

0.066 g of metal was deposited when a current of 2 ampere is passed through a metal ion solution for 100 seconds. What is the electrochemical equivalent (in gram coulomb^-1) of the metal ?

• 3.3 × 10^-6

• 3.3 × 10^-4

• 0.033

• 3.3

When X amperes of current is passed through molten AlCl₃ for 96.5 s, 0.09g of aluminium is deposited. What is the value of X?

• 10 ampere

• 20 ampere

• 30 ampere

• 40 ampere

In the extraction of sodium by Down's process, cathode and anode respectively are

• copper and nickel

• copper and chromium

• nickel and chromium

• iron and graphite

The standard reduction potentials of Zn²⁺| Zn, Cu²⁺| Cu and Ag⁺| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :

(1) Zn | Zn²⁺ || Cu²⁺ | Cu

(2) Zn | Zn²⁺ || Ag⁺ | Ag

(3) Cu | Cu²⁺ || Ag⁺ |Ag

What is the correct order of E${}_{\mathrm{cell}}^{°}$ of these cells?

• 2 > 3 > 1

• 2 > 1 > 3

• 1 > 2 > 3

• 3 > 1 > 2

129.

What is the quantity of electricity (in Coulombs) required to deposit all the silver from 250 mL of 1 M AgNO₃ solution?

• 2412.5

• 24125

• 4825.0

• 48250

Which of the following is not correct?

• Aqueous solution of NaCl is an electrolyte

• The units of electrochemical equivalent are g-Coulomb

• It the Nernst equation, n represents the number of electrons transferred in the electrode reaction.

• Standard reduction potential of hydrogen electrode is zero volt