Match the following columns: Column I Column II (i) Electrode connected to positive terminal of battery. (a) Cathode (ii) Electrode connected to negative terminal of battery. (b) Anode (iii) Substance which undergoes decomposition in aqueous solution, when current is passed (c) Non–electrolyte (iv) Substance which does not allow electric current to pass through it neither in aqueous not in molten state. (d) Electrolyte

(i) The electrode connected to positive terminal of battery is known as anode. Oxidation takes place here. (ii) The electrode connected to negative terminal of battery is known as cathode. Reduction takes place in this electrode. (iii) Substance which undergoes decomposition in aqueous solution, when current is passed is known as electrolyte. Usually ionic compounds are strong electrolytes. (iv) Substance which does not allow electric current to pass through it neither in aqueous not in molten state is known as non-electrolyte. Usually covalent compounds are non-electrolytes. Column I Column II (i) Electrode connected to positive terminal of battery. (b) Anode (ii) Electrode connected to negative terminal of battery. (a) Cathode (iii) Substance which undergoes decomposition in aqueous solution, when current is passed (d) Electrolyte (iv) Substance which does not allow electric current to pass through it neither in aqueous not in molten state. (c) Non–electrolyte

Match the following columns: Column I Column II (i) Electroplating (a) For purification (ii) Electro refining (b) For the extraction of metal (iii) Electro metallurgy (c) For decoration purpose.

(i) Electroplating is used for decoration purposes. It is also used for the prevention of corrosion. (ii) Electro refining is used for the purification of metals extracted which is done using electrolysis. (iii) Electro metallurgy is the process used for the extraction of metals with high reactivity. Column I Column II (i) Electroplating (c) For decoration purpose. (ii) Electro refining (b) For the extraction of metal (iii) Electro metallurgy (a) For purification

Match the following columns: Column I Column II (i) Potassium (a) Generally extracted by the reducing agent (ii) Iron (b) Extracted by thermal decomposition (iii) Platinum (c) Can be extracted by electrolysis in fused state.

(i) The metals like potassium can be extracted by electrolysis in fused state. This is because, it is placed on the top of the reactivity series. (ii) Iron is a moderately reactive metal and hence it can be reduced by using conventional agents like carbon. (iii) Platinum is a low reactive metal and hence it can be extracted by thermal decomposition. That is, by heating, it can be reduced. Column I Column II (i) Potassium (c) Can be extracted by electrolysis in fused state. (ii) Iron (a) Generally extracted by the reducing agent (iii) Platinum (b) Extracted by thermal decomposition

For the electro-refining of copper, what is the cathode made up of?

In the electro-refining of copper, the cathode is made up of pure thin sheet of copper and the anode is made up of impure plate of copper and the electrolyte used here is aqueous copper sulphate solution.

Give a reason for the following. Conductivity of dilute hydrochloric acid is greater than that of acetic acid.

HCl is a strong electrolyte and hence it can dissociate completely in aqueous solution which make it a good conductor of electricity whereas acetic acid is a weak electrolyte and it partially dissociates into ions which makes it a poor conductor than dilute hydrochloric acid.

E M B I B E

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 12

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IMPORTANT

Earn 100

In the process of electrolysis of $N a C l$ , the gas released at anode is

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Important Questions on Electrolysis

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IMPORTANT

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 13

Most reactive element among the following is:

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IMPORTANT

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 14

In which of the following will a redox reaction occur?

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IMPORTANT

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 15

Electrolysis of a concentrated solution of

X

using graphite elements produces a brown colouration around one electrode and deposition of metal on the other. What could

X

be?

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All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 16

The process of electrolysis is used for

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IMPORTANT

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 17

Match the following columns:

	Column I		Column II
(i)	Electrode connected to positive terminal of battery.	(a)	Cathode
(ii)	Electrode connected to negative terminal of battery.	(b)	Anode
(iii)	Substance which undergoes decomposition in aqueous solution, when current is passed	(c)	Non–electrolyte
(iv)	Substance which does not allow electric current to pass through it neither in aqueous not in molten state.	(d)	Electrolyte

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All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 18

Match the following columns:

	Column I		Column II
(i)	Electroplating	(a)	For purification
(ii)	Electro refining	(b)	For the extraction of metal
(iii)	Electro metallurgy	(c)	For decoration purpose.

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IMPORTANT

All in One - ICSE Chemistry>Chapter 6 - Electrolysis>CHAPTER EXERCISE>Q 19

Match the following columns:

	Column I		Column II
(i)	Potassium	(a)	Generally extracted by the reducing agent
(ii)	Iron	(b)	Extracted by thermal decomposition
(iii)	Platinum	(c)	Can be extracted by electrolysis in fused state.