Chemistry Test 94

E° for Cr³⁺ + 3e^– → Cr and Cr³⁺ + e^– → Cr²⁺ are –0.74V and –0.40V respectively. E° for the reaction is :-
Cr²⁺ + 2e^– → Cr

The concentration of ZnCl₂ is changed, if it is placed in the following vessel :-

How much the potential of a hydrogen electrode will change when its solution initially at pH = 0 is changed to pH = 1 ?

For this cell which of the following is correct :

Which metal will dissolve if the cell works Cu|Cu²⁺ || Ag⁺ | Ag:-

The hydrogen elecrtrode is dipped in a solution of pH = 3 at 25°C. The reduction potential of the cell would be :-

What products are formed during the electolysis of concentrated aqueous solution of sodium chloride?

(I) Cl₂(g) at anode
(II) NaOH as electrolyte
(III) H₂(g) at cathode

If 54 g of silver is deposited during an electrolysis reaction, how much aluminium will be deposited by the same amount of electric current ?

Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal
(At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is :-
Al³⁺ + 3e^– → Al⁰
To prepare 5.12kg of aluminium metal by this method would require

The time required to remove electrolytically one fourth of Ag from 0.2 litre of 0.1M AgCl solution by a current of 0.1 ampere is approximately.