Question # 1

The element with highest E°red

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N

F

O

CI

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

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Oxidation

reduction

Redox reaction

electrolysis

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

Which of the following molecules has angel of 120°

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BeCl2

BF3

CH4

NH3

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?

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Magnesium bromide

Magnesium sulphate

Copper sulphate

Copper chloride

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

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Mg

Pt

Zn

Ca

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

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

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H2

O2

Cu

CI

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 potential difference set up at 25 C and 1 atm when clectrode is dipped m Tis one molar ionic sohution is called

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Single electrode potential

electrode potential

Standard electrode potential

Standard hydrogen electrode

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

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

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Hydrolysis

Oxidation

Reduction

Redox

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

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

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

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Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

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