Question # 1

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

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Oxidation

reduction

Redox reaction

electrolysis

The element with highest E°red

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N

F

O

CI

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

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Mg

Pt

Zn

Ca

Coinage metals Cu. Ag, and Au are the least reactive because they have

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Negative reduction potential

Positive reduction potential

Negative oxidation potential

Positive oxidation potential

Coinage metals Cu, Ag and Au are the least reactive because they have

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Negative reduction potential

Negative oxidation potential

Positive reduction potential

Positive oxidation 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

In MgCl2, the oxidation state ofCI is

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Zero

-2

+2

-1

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

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

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

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

Which of the following bonds is not present in NH4CL

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lonic bond

Covalent bond

Co-ordinate covalent bond

De-localized covalent bond

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 common oxidation number of halogens is}

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-1

+1

-2

0

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

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 cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

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