Page 183 - Chemistry ICSE Class X

Electrolysis 169
Q 20. Choose the correct answer from the options given below. [ICSE 2016]

The particles present in strong electrolytes are:
(A) only molecules (B) mainly ions
(C) ions and molecules (D) only atoms
Q 21. Write equations for the reactions taking place at the two electrodes (mentioning clearly the name of the electrode)
during the electrolysis of: [ICSE 2016]
K #EKFKſGF EQRRGT UWNRJCVG UQNWVKQP YKVJ EQRRGT GNGEVTQFGU
(ii) Molten lead bromide with inert electrodes.
Q 22. K 0COG VJG RTQFWEV HQTOGF CV VJG CPQFG FWTKPI VJG GNGEVTQN[UKU QH CEKFKſGF YCVGT WUKPI RNCVKPWO GNGEVTQFGU
(ii) Name the metallic ions that should be present in the electrolyte when an article made of copper is to be
electroplated with silver. [ICSE 2016]
Q 23. Give reasons why: [ICSE 2016]
(i) Sodium chloride will conduct electricity only in fused or aqueous solution state.

(ii) In the electroplating of an article with silver, the electrolyte sodium argento-cyanide solution is preferred
over silver nitrate solution.
(iii) Although copper is a good conductor of electricity, it is a non-electrolyte.

Q 24. Identify the substance underlined, in each of the following cases: [ICSE 2017]
(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.
Q 25. State the observations at the anode and at the cathode during the electrolysis of: [ICSE 2017]
(i) fused lead bromide using graphite electrodes.

(ii) copper sulphate solution using copper electrodes.
Q 26. Choose the correct answer from the options given below: [ICSE 2018]
6JG GNGEVTQN[UKU QH CEKFKſGF YCVGT KU CP GZCORNG QH
(A) Reduction (B) Oxidation
(C) Redox reaction (D) Synthesis
Q 27. State one relevant observation for the following: [ICSE 2018]
At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
Q 28. Name the gas that is produced in the following case: [ICSE 2018]
#V VJG CPQFG FWTKPI VJG GNGEVTQN[UKU QH CEKFKſGF YCVGT

Q 29. Fill up the blank with the correct choice given in brackets. [ICSE 2018]
Electrolysis of aqueous sodium chloride solution will form _____________ at the cathode. (hydrogen gas/sodium
metal)
Q 30. (QT VJG GNGEVTQ TGſPKPI QH EQRRGT [ICSE 2018]

(i) What is the cathode made up of?
(ii) Write the reaction that takes place at the anode.