Chemistry For Third Secondary → The Galvanic cell quiz1

Created on April 03, 2023 By

gogorabei

Electrochemistry -The Galvanic Cell

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(4) On reaction of zinc with dil. HCI.--------- gas evolves and -------------occurs for zinc

(a.) hydrogen/oxidation

(b) sulphur dioxide / oxidation

(d) sulphur dioxide / reduction

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(3) Where does oxidation take place in an electrochemical cell?

(.a) The anode.

(b) The cathode.

(d) The half-cell.

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(2) In which system does a spontaneous redox reaction produce an electrical energy?

(.a) Galvanic cell. .

(b) Electrolytic cell.

(d) Half-cell.

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In the galvanic chemical energy is converted into -------- energy (1)

(a) kinetic cell,

(.b) electric

(d) magnetic

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(5) The oxidation number in the anode reaction -----------

(a) decreases.

(b.) increases.

(e) doesn't change. (d) sometimes decreases or increases.

(d) sometimes decreases or increases.

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(6) In an electrochemical cell, the anode is the ------

(a) neutral electrode.

(b) electrode at which matter can gain or lose electrons.

(d) electrode at which matter loses electrons.

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(7) The movement of electrons or other charged particles is described as a/an ------------

(a) electric potential.

(b) electric current..

(d) electrode reaction.

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b).

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a.)

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(31) The standard hydrogen electrode consists of platinum sheet covered by a layer of ---------

(a) black spongy platinum. .

(b) zinc.

(d) mercury.

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(30) The standard electrodes potentials for the elements are measured relatively to the standard --------- electrode

(a) oxygen

(b) nitrogen

(c.) hydrogen

(d) Helium

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(28) In the following oxidation-reduction reaction:

2BrO^-_3(aq) +10Cl^-_(aq) +12H⁺_(aq) >>> Br_2(g)+5Cl_2(g)+6H_2(g)

Which equation represents the oxidation reaction?

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

(b)2H⁺_(aq) >>> H_2(g) + 2 e^-

(c) BrO^-_3(aq) + 6H⁺_(aq) >>> 1/2Br_2(g) +3H₂O_(l)

(d)BrO^-_3(aq) + 6H⁺_(aq) >>> 1/2Br_2(g) +3H₂O_(l)+ 5e^-

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(29) In the galvanic cell, the salt bridge -----------

(a) neutralizes the charges

(b) allows the continuous passage of electric current in the external electric wires

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

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(27) In the reaction of

Mg(s) +Cl_2(g)>>> MgCl2(aq)

the correct oxidation reaction is:

(a) Mg⁰_(s) +2e^- >>> Mg²⁺_(aq)

(b) Cl⁰_2(g) + 2e^- >>> 2 Cl^-_(aq)

(c) Mg⁰_(s) >>> Mg²⁺_(aq) + 2e^-

(d) Cl⁰_2(g)>>> 2Cl^-_(aq) + 2 e^-

c.)

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(26) Which of the following statements represents a spontaneous reaction of

2Cr⁰_(s) +3Fe³⁺ _(aq) >>> 2Cr³⁺_(aq) + 3Fe⁰_(s) ? -----------

(a) Electrons move from iron electrode to chromium electrode

(b) Anions move through salt bridge from chromium half-cell to iron half-cell

(d.) Reaction is accompanied by releasing an energy

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(25) The cell diagram of the galvanic cell:

Zn⁰_(s) + Cu⁺⁺ >>> Zn⁺⁺_(aq) + Cu⁰_(s) is -----------

(a)Zn⁰_(s) /Cu⁺⁺_(aq) // Zn⁺⁺_(aq) / Cu_(s)

(b) Cu⁺⁺_(aq) / Cu⁰_(s) // Zn⁰_(s)/ Zn⁺⁺_(aq)

(c.) Zn⁰_(s) /Zn⁺⁺_(aq) // Cu⁺⁺_(aq)/Cu⁰_(s)

(d) Zn⁺⁺_(aq)/ Zn⁺_(aq)// Cu⁺⁺_(aq) / Cu⁰_(s)

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(24) In the galvanic cell, the anode is the --------

(a.) negative electrode which is oxidized.

(b) positive electrode which is oxidized.

(d) positive electrode which is reduced.

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(23) The equation -------------- is a correct ionic equation.

a)Cu2+ + Fe(s) >>> Fe3+(aq) + Cu (s)

b)Cu2+ (aq) + OH-(aq) >>> Cu(OH)2(s)

c)Cu++ (aq) + SO-- (aq) >>> CuSO4(aq)

d.)Cu++(aq) + 2OH-(aq) >>> Cu(OH)2(s)

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(22) On electrolysis of copper (II) chloride by using two graphite electrodes.---------- substance is precipitated.

(a.) Copper

(b) copper (I) oxide

(d) copper (II) sulphide

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(20) The flow of electricity through the electrolytic solutions is due to the migration of -----------

(a) electrons.

(b.) ions

D) a and b

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(19) In an operating electrochemical cell, the function of a salt bridge is to ------

(a) allow hydrolysis to occur.

(b) allow a non-spontaneous reaction to occur.

(c.) permit the migration of ions within the cell.

(d) transfer electrons from the cathode to the anode.

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(18) The standard half-cell

(a.) represents an open circle, where there is no flow of electrons from it or to

(b) occurs to the surface of electrode dipped in it an oxidation process only

(d) It always equals zero.

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(17) What is the standard reduction electrode which has a half-cell potential of 0.00 V?

(a) Oxygen

(b.) Hydrogen

(d) Na

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(16) In a voltaic cell, from which electrode do the free electrons originate

(a.) Anode only.

(b) Cathode only.

(d) Neither anode nor cathode

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(15) Which electrode is labeled as a positive in a voltaic cell?

(a) Anode only.

(b) Cathode only..

(d) Neither anode nor cathode.

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(14) What happens in the half-cell ?

(a) Oxidation only.

(b) Reduction only.

(d) Both oxidation and reduction..

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(13) A more positive value for electrode's reduction potential means the electrode is more likely to be a/an

(a) anode.

(b) cathode. .

(d) electrochemical cell.

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(12) Corrosion is the disintegration of metals through -----

(a) combustion.

(b) reduction.

(c.) oxidation.

(d) exposure.

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(11) For electricity to flow in a voltaic cell, the two half-cells must be

(a) connected by a wire and a porous barrier..

- (b) completely isolated from each other.

(d) connected to a dry cell.

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(10) What is the type of the cell which generates an electric energy ? ----

(a) Electrolytic cell.

(b) Electroplating cell.

(d) Oxidation cell.

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The Galvanic cell quiz1

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