Question # 1

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

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

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Mg

Pt

Zn

Ca

^{The common oxidation number of halogens is}

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-1

+1

-2

0

During the electrolysis of Fused NaCI, the products are

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Na and H2

Na and Cl2

Na and O2

H2 and Cl2

The element with highest E°red

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N

F

O

CI

The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

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

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode

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H2

O2

Cu

CI

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute

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Oxidation

reduction

Redox reaction

electrolysis

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

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

Most reactive among the following

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Li

Mg

Ca

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

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

The products of electrolysis of which of the followings are known

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Fused electrolyte

Aqueous solution of eleetrolyte

Solid electrolyte

Solid metal

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

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

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