ELECTROLYSIS ICSE CHEMISTRY class 10 - QUICK REVISION TEST

ELECTROLYSIS -QUICK REVISION TEST CLASS 10 ICSE CHEMISTRY

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a) Name the following.

i) The electrolyte which contains only ions and conducts large amounts of electric current.

ANS: Strong electrolyte

ii) The electrode which takes part in electrolysis.

Ans: Active Electrode

iii) The impurities collected under anode during electro-refining of an impure metal.

Ans: Anode mud

iv) The greyish metal deposited on cathode during the electrolysis of a fused salt.

Ans: Lead

v) The electrolyte used in electroplating an article with Silver.

Ans: Sodium Argento Cyanide

b) State your observation in each of the following cases.

i) At cathode in the electrolysis of Copper sulphate using copper electrodes.

Ans: Pinkish brown deposit

ii) In the electrolyte during the electrolysis of Copper sulphate using inert (Platinum) electrodes.

Ans: Blue colour of the solution fades

iii)At anode during the electrolysis of acidified water.

Ans: A colourless gas which rekindles a glowing splint

iv) At anode during electrolysis of fused Lead bromide.

Ans: Reddish brown fumes

v) At cathode during the electrolysis of a salt in its fused state.

Ans: Greyish metal deposit.

c) Give Reason 

i) Alternate current is not passed through the electrolyte during electroplating.

Ans: alternate current causes discharge and ionization to alternate at the electrodes which does not give a smooth deposition on metal.

ii) Blue colour of the electrolyte does not fade during the electrolysis of Copper sulphate when Copper electrodes are used.

Ans: The Copper ions discharged at cathode will be replaced by anode.

d) Write balanced electrode equation at:

i)  anode in the electrolysis of fused Lead bromide

Ans: 2Br^1- + 2e^- -- > Br₂

ii) cathode in the electrolysis of Copper sulphate.

Ans :Cu²⁺ + 2e^- -- > Cu

iii) anode in the electrolysis of Copper  sulphate using Copper electrodes.

Ans : Cu – 2e^- -- > Cu^2-

iv) Cathode in the electroplating an article with Nickel.

Ans: Ni²⁺ + 2e^- -- > Ni

e) A water soluble _________(weak/ strong) electrolyte undergoes __________(complete/ partial) dissociation in its aqueous solution and conducts large amount of electric current through it. It contains ___________ (ions only/ molecules only/ ions  and molecules)