Chemistry For Third Secondary → The Galvanic Cell quiz2

Created on April 05, 2023 By

gogorabei

Electrochemistry The Galvanic Cell Quiz2

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(41) X. Y. Z and W are four metals, on heating

Z+W oxide >>> Z oxide + W

X+Z oxide. >>> No reaction

X+Y oxide >>> X oxide + Y

X+W oxide >>> No reaction

So, the metals are arranged, according to their chemical activity as:

(A) Y<X<W<Z (c) X<Y<Z<W

(b) Y<X<Z<W (d) X<Y<W<Z

(A)

(b)

(c)

(d)

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(40) Chromium reacts with water vapour, but it doesn't react with cold water and reacts slowly with dil. hydrochloric acid, but it replaces copper from copper (II) nitrate solution. So, chromium is arranged, according to its activity as

(b) copper > sodium > chromium.

(a) copper> chromium> sodium.

(c) sodium > copper> chromium.

(D) sodium > chromium > copper.

(a)

(b)

(c)

(D)

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(39) According to the two spontaneous reactions:

2Cr_(s)+3Fe_(s) >>> 2Cr³⁺_(aq) + 3Fe_(s)

Fe_(s) + Pb²⁺_(aq) >>> Fe²⁺_(aq) + Pb_(s)

-------- is considered as a strong reducing agent.

(A) Cr_(s) (b) Cr³⁺_(aq) (c) Pb²⁺_(aq) (d) Pb_(s)

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(38) The reduction potentials of four elements are:

X²⁺ / X⁰ E⁰=-0.76 V Y²⁺ / Y⁰ E⁰=+0.34 V

Z²⁺ / Z⁰ E⁰=-0.28 V W⁺ / W⁰ E⁰=+0.8 V

The more active element which replaces the other elements in their salt solutions is -----

(a) W

(B) X

(d)Z

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(37) The elements that have positive oxidation potentials

(a) act as the cathode in galvanic cells

(b) Replace hydrogen ions in its acidic solutions.

(d) have the ability to gain electrons.

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(36) If the standard reduction potential of the gold equals 1.42 volt, its standard oxidation

potential equals ----------- volt.

(a)+1.42

(b) zero

(c)-1.42.

(d)-0.76

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(35) In the electromotive series, the elements are arranged in .....

(a) descending order, according to their positive reduction potentials.

(b) ascending order, according to their negative reduction potentials.

(D) descending order, according to their negative reduction potentials.

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(34) The standard reduction potential of hydrogen equals ------ volts

(a)+0.76

(b)+0.34

(d)-0.76

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(33) The anion is formed when the --------- an electron or more.

(a) metal gains

(b) metal loses

(d) non-metal loses

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(49) What is the standard potential of a cell made of theoretical metals Ma⁰/Ma²⁺ and Mb⁰ /Mb²⁺ if the reduction potentials are - 0.19 V and - 0.85 V respectively

(A) +0.66 V

(b)-0.66 V

(d)-1.04V

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(48) If the standard reduction potentials for zinc and nickel are -0.76 volt and -0.23 volt respectively.

So, the emf of the cell equals ------------ volt.

(a)-0.53

(b) 0.175

(d)0.99

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(47) The electromotive force of a galvanic cell equals

(a) oxidation potential = reduction potential

(b) reduction potential - oxidation potential

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

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(46) In the galvanic cell which is represented by the cell diagram:

(a) copper is the anode.

(b) Copper ions are oxidizing agent.

(d) oxidation potential of copper is more than that of chromium.

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(45) The standard reduction potentials for manganese, zinc and iron are -1.03,-0.76 and -0.41 volt respectively.

So, the reaction that expresses the galvanic cell is

a) Fe⁰_(s)+Zn⁺⁺_(aq) >>> Fe⁺⁺_(aq) +Zn⁰_(s)
b) Fe⁰_(s) + Mn⁺⁺_(aq) >>> Fe⁺⁺_(aq) + Mn⁰_(s)
c) Mn⁰_(s) + Zn⁺⁺_(aq) >>> Mn⁺⁺_(aq) +Zn⁰_(s) .
d) Mn⁰_(s) + Zn⁺⁺_(aq) >>> Mn⁺_(aq) + Zn⁰_(s)

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(65) Fuel cells are -------------- cells.

(a) primary

(b) galvanic

(d) Both (a) and (b)

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(64) The aqueous --------------- solution is used as an electrolytic solution in H₂ - O₂ fuel cell.

(a) NaOH

(B) KOH

(d) Mg(OH)2

17 / 30

(63) The main function of a fuel cell is to -------------

(a) produce fuel.

(b) electrolyze fuel.

(d) Produce Electricity.

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(62) The electrolyte in the mercury cell is ……………

(a) manganese dioxide paste.

(b) mercury (II) oxide.

(d) Potassium hydroxide.

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(61) The mercury cell is ------------

(a) non-spontaneous secondary cell.

(b) non-spontaneous primary cell.

(d) Spontaneous primary cell.

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(60) In mercury cell, the negative pole is ----------

(a) mercuric oxide.

(b) Lead oxide.

(d) lead dioxide.

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(59) The primary cells are -------- cells.

(A) galvanic spontaneous irreversible

(b) electrolytic irreversible

(d) easily charged electrolytic

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(58) The metal at the top of electromotive series is the ------------

(a) most stable.

(b) least active.

(D) most active.

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(57) Manganese is above cadmium in the electromotive series. So, if the standard manganese electrode and cadmium electrode are coupled to form a cell, in such cell -----

(a) cadmium is oxidized.

(b) manganese gains electrons.

(d) cadmium loses electrons.

24 / 30

(56) When a voltaic cell operates, ions move through the ------

(a) anode.

(b) cathode.

(d) external circuit.

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(55) The given balanced ionic equation represents the reaction in an operating voltaic cell:

Zn⁰_(s) + Cu²⁺_(aq) >>>> Zn²⁺_(aq) + Cu⁺_(s)

The flow of electrons through the external circuit in this cell is from the

(a) Cu anode to the Zn cathode.

(b) Cu cathode to the Zn anode.

(d) Zn cathode to the Cu anode.

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(70) Which of the following statements is correct about fuel cell ?

(a) A primary cell stores the electric energy.

(b) Its electrolyte is sulphuric acid.

(d) Its E cell equals 3 V

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(69) The two electrodes of fuel cell are lined by a porous layer of -----------------

(a) aluminum oxide.

(b) Carbon.

(d) iron.

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(68) What happens when H₂, O₂ gases are used in fuel cell ?

(a) Electric energy is used in water production.

(b) An electric energy generates directly..

(d) H2 is reduced forming water vapour.

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(67) In the fuel cell, the............. is reduced.

(a) zinc

(b) ammonium chloride

(d) Oxygen

30 / 30

(66) In H₂- O₂ fuel cell, O₂ gas acts as -------

(a) anode.

(b) cathode.

(d) Oxidant

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The Galvanic Cell quiz2

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