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Chemistry For Third Secondary

Chemistry For Third Secondary

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chapter2:chemical analysis Quizzes
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chapter one :The transition Elements
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chapter5:Organic chemistry
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chapter3: Chemical equilibrium
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The Galvanic cell and electrolytic cell quiz 5

Created on April 12, 2023 By

gogorabei

The Galvanic cell and Electrolytic cell quiz 5

1 / 33

(24) Which net reaction does occur by the process of electrolysis?

(A) 2H₂O_(l) >>> 2H_2(g) +O_2(g)

(b) 2HgO_(s) >>> 2Hg_(l)+ O_2(g)

(c) 2KClO_3(l) >>> 2KCl_(s) + 3O_2(g)

(d) MgCO_3(s)>>> MgO_(s) + CO_2(s)

2 / 33

(23) Electroplating always takes place

(a) in the wire.

(b) at the anode.

(d) at the salt bridge.

3 / 33

(22) At the cathode during electrolysis, what is its charge and which type of the reaction occurs?

(a) (-), oxidation.

(b) (+), oxidation.

(d) (+),reduction

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(20) Which statement describes one characteristic of an operating electrolytic cell?

(a) It produces an electric energy.

(b) It Requires an external energy source.

(d) It undergoes a spontaneous redox reaction.

5 / 33

(19) What happens in an electrolytic cell containing CuCl_2(aq)?

(a) Cu²⁺ ions migrate towards the positive electrode.

(b) Cl^- ions migrate towards the negative electrode.

(c) Cu²⁺ ions are Reduced.

(d) Cl^- ions are reduced.

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(18) In an electrolytic cell, the anode acts as ………….

(a) The positive electrode, where oxidation occurs

(b) the positive electrode, where reduction occurs.

(d) the negative electrode, where reduction occurs.

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(17) Which half-reaction occurs at the negative electrode in an electrolytic cell in which an object is being plated with silver?

(a) Ag^o + e^- >>> Ag⁺_(aq)

(b) Ag^o_(s) >>> Ag⁺_(aq) + e^-

(C) Ag⁺_(aq) + e - >>> Ag^o_(s)

(d) Ag⁺_(aq) >>> Ag^o_(s)+ e^-

8 / 33

16) How is aluminum currently produced in industry?

(a) By reduction of Al³⁺ in Al₂O₃ with Na_(s)

(b) Electrochemical reduction of pure Al₂O₃ to give Al and O₂

(c) Electrolysis of AlF₃ to give Al and F₂

(D) Electrolysis of a mixture of Al₂O₃ and Na₃AIF₆ to give Al and O₂

9 / 33

(15) A molten binary salt (ZnCl₂) undergoes the electrolysis.

The cathode reaction is

(a) Zn_(s) >>> Zn²⁺ + 2e^-

(b) 2Cl^-_(aq)>>> Cl_2(g) +2e^-

(c) Cl^o_2(g) +2e^- >>> 2Cl^-_(aq)

(D) Zn²⁺_(aq)+2e^- >>> Zn^o_(s)

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(14) The substance formed at the cathode during the electrolysis of molten ZnCl₂ is

(a) Zinc.

(b) oxygen.

(d) hydrogen.

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(40) In the electrolytic cell for purification of copper, the cathode used is a/an

(a) graphite rod.

(b) Impure Copper.

(d) copper sulphate solution.

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(39) On the electroplating a spoon of copper by a layer of silver, we use ------

(a) silver cathode in copper sulphate solution.

(b) Silver Anode in silver nitrate solution.

(d) graphite anode in silver nitrate solution.

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(38) In the electroplating process ……...

(a) the electrolyte is consumed.

(b) the cathode is consumed

(d)No correct answer.

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(37) The galvanization of iron with zinc is expressed by the reaction:

(a)Fe⁺⁺_(aq) + 2e^- >>> Fe⁰_(s)

(B)Zn⁺⁺_(aq) + 2e^- >>> Zn^o_(s)

(c) Fe^o_(s) >>> Fe⁺⁺_(aq) + 2e^-

(d)Zn^o_(s) >>> Zn⁺⁺_(aq) + 2e^-

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(36)On passing the same quantity of the electricity in different electrolytic cells connected in series, the mass of deposited elements at the electrodes is directly proportional to their

(a) atomic masses

(b) atomic number

(d) Equivalent mass

16 / 33

(35) To deposit one ……… of substance, a quantity of electricity of one faraday is required

(a) mole

(b) g/atom

(d) (a). (b) and (c)

17 / 33

(34) ……….. had deduced the relationship between the quantity of electricity which flows on a solution and the quantity of material liberated at electrodes.

(a) Le Chatelier

(b) Waage

(D) Faraday

18 / 33

(33) If the sum of the oxidation and reduction potentials of the two half-cells has a negative sign, it means that the reaction is -----

(a)spontaneous

(b)completed without an external source of electricity

(c)Completed in an electrolytic cell

(d)completed in a galvanic cell.

19 / 33

(32) The positive ions in the electrolytic solution.

(a) transfer towards the cathode.

(b) neutralized by gaining electrons.

(d) (a). (B) and (c).

20 / 33

(31) The electrolyte solution may be ……

(a) a salt solution.

(b) an alkaline solution.

(d) (a), (B) and (c)

21 / 33

(46) How many coulombs of charge are required to deposit 0.5 mol of Ag from a solution of AgNO₃?[Ag=108)

(A)0.5F

(b) 1 F

(d) 108 F

22 / 33

(50) To deposit 32.5 g of zinc by the electrolysis of zinc chloride, …………… faraday(s) is required. [Zn=65]

(a) 0.2

(b) 0.5

(d) 2

23 / 33

(49) We have 100 ml. of a solution of Cu²⁺_(aq) ion and wish to determine [Cu²⁺_(aq)]

We electrolyze the solution to produce Cu_(s), and use 1.5 amp of current for 1120 seconds to complete the process.

What was the concentration of Cu²⁺_(aq) in the solution? ……..

(a) 0.174 M

(b) 0.871 M

(d) 1.74 M

24 / 33

(48) If we wish to convert 1.00 g of Au³⁺_(aq) ion into Au_(s) in a "gold-plating" process,how long must we electrolyze a solution if the current passing through the circuit is 2.00 amps?[Au=197]

(a) 245 sec

(b) 0.50 sec

(d) 735 sec.

25 / 33

47) How many coulombs of charge are required to form 1.00 pound of Al^o_(s) from Al³⁺ salt?-----

(a) 4.83 x 10⁶

(b) 50.5

(c) 1.62 x 10⁶

(d) 454

26 / 33

(45) The basic reaction occurring in the cell in which Al₂O₃ and aluminum salts are electrolyzed is:

Al³⁺ + 3e^- >>> AL^o_(s).

If the cell operates at 5.0 V and 1.0 x 10⁵ amps and you want to produce 600 pounds of aluminum metal, how many hours will you need to operate the cell ?[1 pound = 450 g ,Al=27]

(a) 1.0 hour

(b) 4,0 hours.

(d) 24.0 hours.

27 / 33

(44) The electroplating is used in …….

(a) reduction of non-metals.

(b)Increasing the value of a metal.

(c ) oxidation of metals.

(d) (a), (b) and (c).

28 / 33

(43) In the electrolytic cell of bauxite, aluminum is separated easily when…….

(a) The Density of the molten decreases.

(b) the melting point of the molten increases.

(d) adding an excess amount of cryolite.

29 / 33

(42) Cryolite is used in extraction process of aluminum from bauxite to ………

(a) Dissolve Bauxite.

(b) prevent the corrosion of anode.

(d) remove the impurities from bauxite

30 / 33

(41) In the electrolytic cell of bauxite, fluorspar is used as a/an

(a) oxidizing agent

(b) Decreasing substance for melting point.

(d) source of aluminum.

31 / 33

(26) In the electrolysis of molten CaCl₂, the oxidized species

(a) Ca

(b) Ca2+

(d) Cl₂

32 / 33

(30) The electric current passes in the molten lead (II) bromide through the

(a) free electrons.

(b) Free ions.

(d) lead metal.

33 / 33

(31) The electrolyte solution may be ……

(a) a salt solution.

(b) an alkaline solution.

(d) (a), (B) and (c)

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The Galvanic and Electrolytic Cells

Quiz about: Electrochemistry and Galvanic Cells

Chemistry For Third Secondary

Curriculum

The Galvanic cell and electrolytic cell quiz 5

The Galvanic cell and Electrolytic cell quiz 5

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