Question # 1

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode

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Zn has less reduction potential than hydrogen and Cu

Zn has high reductionl potential than hydrogen

and Cu

Zn is below electrochemical series than hydrogen and Cu

Zn has least tendency to lose electron

Which one of the following metals can replace the Copper from aqueous solution of its salt more easily?

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Cd

Fe

Zn

Na

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

Only those metals can replace Hydrogen from dilute acids, which have

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High negative reduction potential

Low negative reduction potential

High positive reduction potential

low positive reduction potential

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

In voltaic cell a saht bridge is used in order to

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Pass the electric current

Prevent the flow of ions

Mix solutions of two half cells

Allow movement of' ions between two cells

Which of the following metal does not liberate hydrogen on reaction with acid?

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Mg

Pt

Zn

Ca

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

The standard electrode potential of hydrogen is arbitrarily taken at 298k is

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1.00volt

0.10 volt

0.00 volt

10.0 volt

The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts

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A

C

B

D

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

Which one of the following elements is the strongest reducing agent?

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Chlorine

Sodium

Magnesium

Aluminium

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