Which of the following is not an application of electrolysis? Type in the appropriate number here. ___
1. Obtaining metals like sodium and magnesium
2. Gold plating of golden temple
3. Making primary batteries.
4. Manufacturing of NaOH and KOH
5. Synthesis of pure copper from impure copper

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Solution

Making primary batteries is not an application of electrolysis. Primary batteries are electrochemical cells and they exclusively involve only spontaneous cell reactions.
Electrolysis has wide applications in industries. Let us look at some of the important applications which are as follows:
(i) Production of hydrogen by electrolysis of water.
(ii) Manufacture of heavy water $D_{2} O$
(iii) The metals like Na, K, Mg, Al are obtained by electrolysis of fused electrolytes.
(iv) Non-metals like hydrogen, fluorine, chlorine are obtained by electrolysis.
(v) In this method pure metal is deposited at cathode from a solution containing the metal ions Ag, Cu etc
(vi) Compounds like NaOH, KOH, white lead, $K M n O_{4}$ etc are synthesised by electrolysis.
(vii) Electroplating: The process of coating an inferior metal with a superior metal by electrolysis is known as electroplating.

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Q. Which of the following is not an application of electrolysis? Type in the appropriate number here.

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Q. When an impure copper rod acts the anode and the pure copper rod acts as the cathode in an electrolysis experiment, then which of the following occurs?

Q. For purification of copper, a thin plate of pure copper and a thick rod of impure copper are used as electrodes. Copper from the impure rod is sought to be transferred to the thin copper plate. Which electrode should be attached to the positive terminal of battery?

In the process of purification of copper metal, a thin plate of pure copper and a thick rod of impure copper are used as electrodes, and a metal salt solution is used as an electrolyte :
(a) Which electrode is connected to the positive terminal of the battery ?
(b) Which electrode is connected to the negative terminal of the battery ?
(c) Which metal salt solution is taken as electrolyte ?

Assertion: Impure copper anode will disappear and pure copper depositions will be seen on cathode.

Reason: During electrolysis, electicity flows and appropriate ions deposits at corresponding electrodes.

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Which of the following is not an application of electrolysis? Type in the appropriate number here. ___ 1. Obtaining metals like sodium and magnesium 2. Gold plating of golden temple 3. Making primary batteries. 4. Manufacturing of NaOH and KOH 5. Synthesis of pure copper from impure copper

Which of the following is not an application of electrolysis? Type in the appropriate number here. ___
1. Obtaining metals like sodium and magnesium
2. Gold plating of golden temple
3. Making primary batteries.
4. Manufacturing of NaOH and KOH
5. Synthesis of pure copper from impure copper