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प्रश्न
Explain electrolysis of lead bromide.
उत्तर
A steel rod is connected to the negative terminal and a graphite rod to positive terminal of a battery. A silica crucible is filled to about two thirds with solid lead bromide and the rods are dipped into into it and is then melted by heating it over a Bunsen burner.
Lead bromide contains :
PbBr2 ⇌ Pb+2 + 2Br-
Reaction at cathode : Lead ions are positively charged they get discharged at cathode. It receives two electrons from cathode and changes to atom of lead and get deposited at the cathode.
Pb+2 + 2e- → Pb
Reaction at the anode : Bromide ions, being negatively charged discharge at anode. It loses its only elctron and becomes an atom of bromine. Thus the atoms of bromine combine in pairs to form molecules of bromine which escape as red vapours, at the anode.
Br- + e- → Br
Br + Br → Br2
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संबंधित प्रश्न
Give reason for the following:
Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid state.
Write down the word or phrase from the bracket that will correctly fill in the blank in the following sentence:
We can expect that pure water ________________ (will / will not) normally conduct electricity.
Explain, why electrolysis is an example of redox reaction?
Name : A salt which is a weak electrolyte.
Choose the correct answer from the option given below:
Which among the following anions will discharge with ease at anode?
Choose the correct answer from the option given below:
In electrolysis of molten lead bromine anode is made up of
Give one example of a substance which contain :
Ions only
Give one example of a substance which contain :
both ions and molecules.
Write the equations of the reactions which take place at the cathode and anode when acidified water is electrolyzed.
Choose A, B, C or D to match the descriptions (i) to (v) below . Some alphabets may be repeated.
(A) Non-electrolyte, (B) Strong electrolyte, (C) Weak electrolyte, (D) Metallic conductor
(i) Molten ionic compound
(ii) Carbon tetrachloride
(iii) An aluminium wire
(iv) A solution containing solvent molecules, solute molecules and ions formed by the dissociation of solute molecules
(v) A sugar solution with sugar molecules and water molecules.
