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IMP. QUESTION OF ELECTROLYSIS

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ELECTROLYSIS. Q. 1. During the electrolysis of molten lead bromide, which of the following takes place : A : Bromine is released at the cathode. B: Lead is deposited at the anode. C : Bromine ions gain electrons. D: Lead is deposited at the cathode. Ans : - D. Q. 2. Here is an electrode reaction : Cu Cu2+ + 2e-. [i.e. Cu- 2e- Cu2+]. At which electrode(anode or cathode) would such a reaction take place. Is this an example of oxidation or reduction. Ans : - At anode. Oxidation. Q. 3. A solution contains magnesium ions(Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode. Write the equation for the cathode reaction. Ans.: - Mg2+ Q.4. An electrode A is connected to the positive terminal of a battery and electrode B to the negative terminal. (i) Give the names of the electrodes A & B. (ii) Which electrode is the oxidizing electrode. Ans : - (i) A Anode, B Cathode. (ii) A. Q. 5. State the appropriate term used for : A liquid or solution, which conducts electricity with accompanying chemical change. Ans.: - Electrolytes. Q.6. Electrons are getting added to an element Y. (i) Is Y getting oxidized or reduced? (ii) What charge will Y have after the addition of electrons? (iii) Which electrode will Y migrate to during electrolysis? Ans : - (i) Reduced (ii) Negative (iii) Anode Q. 7. Explain how electrolysis is an example of redox reaction. Ans.: - A redox reaction is one in which reduction and oxidation occurs simultaneously. (i) Cathode (Reducing electrode) : At cathode, the cations gain electrons to form neutral atoms. As electrons are gained, the ion is said to be reduced. (ii) Anode (Oxidizing electrode) : At anode, the anions lose electrons to form neutral atoms. As electrons are lost, the ion is said to be oxidized. Q. 8. What kind of particles will be found in a liquid compound which is a non-electrolyte? Ans.: - Molecules. Q.9. Complete the sentence by choosing the correct words Electrolysis is the passage of [electricity / electrons] through a liquid or a solution accompanied by a . [physical / chemical] change. Ans.: - Electricity, Chemical.

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