When X amperes of current is passed through molten AlCl3 for 96.5

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

121.

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-


122.

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

  • 1:2

  • 2:3

  • 1:1

  • 1:3


123.

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


124.

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

  • H2SO3

  • H2S2O8

  • O2

  • H2


Advertisement
125.

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


Advertisement

126.

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


A.

10 ampere

Current I =?

Equivalent weight of Al = 273=9w= zItI= wzt= 0.09 ×965009 × 96.5= 10 ampere


Advertisement
127.

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


128.

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 Ecell° of these cells?

  • 2 > 3 > 1

  • 2 > 1 > 3

  • 1 > 2 > 3

  • 3 > 1 > 2


Advertisement
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


130.

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


Advertisement