Electrolysis Archives - Page 6 Of 9

State the observations at the anode & at the cathode during the electrolysis of –
(i) Fused lead bromide using graphite electrodes.
(ii) Copper sulphate solution using copper electrodes.

(i) The observations at the anode & at the cathode are: At cathode — silvery grey deposit of lead metal. At anode — reddish brown fumes of bromine vapours. (ii)…

Identify the substance underlined, in each of the following —
(i) The electrolyte used for electroplating an article with silver.
(ii) The particles present in a liquid such as kerosene, that is a non-electrolyte.

(i) Sodium argentocyanide (ii) Molecules only

Give reasons why:
(i) Sodium Chloride will conduct electricity only in fused or aq. soln. state.
(ii) In the electroplating of an article with silver, the electrolyte sodium argentocyanide soln. is preferred over silver nitrate solution.
(iii) Although copper is a good conductor of electricity, it is a non-electrolyte.

(i) The ions Na+ and Cl– are not free but held together by strong electrostatic force of attraction. In fused or molten state the ions break free and move. Hence, NaCl will…

Name: (i) the product formed at the anode – during electrolysis of acidified water using platinum electrodes. (ii) the metallic ions that should be present – in the electrolyte when an article made of copper is to be electroplated with silver.

(i) Oxygen (ii) Silver ions

Write equations for the reactions taking place at the two electrodes during the electrolysis of:
(i) Acidified CuSO4 solution with copper electrodes.
(ii) Molten PbBr2 with inert electrodes. (mention clearly the name of the electrode in each case)

(i) Electrode — Cathode : Copper, Anode : Copper Dissociation of aq. CuSO4 : CuSO4 ⇌ Cu2+ + SO42- H2O ⇌ H1+ + OH1- H2SO4 ⇌ 2H1+ + SO42- Reaction at cathode [pure thin sheet of…

The particles present in strong electrolytes are:
Select the correct answer from A, B, C and D:
A: only molecules
B: mainly ions
C: ions and molecules
D: only atoms

mainly ions

During purification of copper – State: (i) The anode used (ii) The electrolyte used. Write the equation taking place at the anode in the above.

(i) Impure block of copper (ii) Aq. copper sulphate solution [acidified] Equation at the anode: Cu – 2e- ⟶ Cu2+

Differentiate between the terms strong electrolyte and weak electrolyte. (stating any two differences)

Strong electrolytes Weak electrolytes They are electrolytes which allow a large amount of electricity to flow through them and hence are good conductors of electricity. They are electrolytes which allow…

Give scientific reasons :
(i) During electrolysis of molten lead bromide, graphite anode is preferred to other electrodes.
(ii) Electrical conductivity of acetic acid is less in comparison to that of dil. H2SO4 – at a given concentration.
(iii) Electrolysis of molten lead bromide is considered to be a redox reaction.

(i) As graphite is unaffected by the reactive bromine vapours released at the anode hence, a graphite anode is preferred during the electrolysis of molten lead bromide. (ii) Dil. H2SO4 is…

State one observation for. ‘At the anode when aqueous copper sulphate solution is electrolysed using copper electrodes’.

Copper anode shows a loss in mass.

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