Question # 1

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

Oxidation number of phosphorus in the compound is.

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+3

+4

+5

+6

If salt bridge is not used between two half cells, than the voltage.

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Decreases rapidly

Decreases slowly

Does not change

Drops of zero

When a non-spontaneous redox reaction is carried out by using the electrical current, then the process is called

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Decomposition of the substances

Cracking

Hydrolysis

Electroiysis

A cell in which electric current is produced as a result of spontaneous redox reaction is called.

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Electrolytic cell

Galvanic cell

Half cell reaction

Down's cell

If strip of Cu metal is placed in the solution of FeSO4

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Cu will be precipitated out

Fe is precipitated out

Cu and Fe both dissolves

No reaction takes place

Electrolysis is a process in which a chemical reaction takes place at the expense of

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Chemical energy

Electrical energy

Heat energy

None of these

Fuel cells are the means by which chemical energy may be converted into

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Heat energy

Magnetic energy

Sound energy

Electric energy

Oxidation number of Cr in a C₂CrO₄ is

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+2

+4

+6

+8

In which compound the oxidation number of Mw is +6

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KMnO4

K2MnO4

MnO2

MnO

Electrolysis is used for

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Electroplating

Refining of copper

Manufacture of caustic soda

All of the above

Oxidation number of carbon in NaHCO₃

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+4

-6

+6

+2

Stronger the oxidizing agent, greater is the

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oxidation potential

Reduction potential

Redox potential

E.M.F of cell

Which of the following statements is correct about galvanic cell

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Anode is negative charged

Reduction occurs at anode

Cathode is positively charged

Reduction occurs at cathode

Which is not use of electrochemical series.

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Feasibility of reaction

Measurement of EMF of cell

Comparison of reactivity with water or acids

Determination of atomic and ionic radii

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

What is oxidation state of chlorine in Ca(ClO3)2

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+1

+3

+5

+7

Electrode of the lead storage battery are immersed in dilute H2SO4 which has strength by mass

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100%

98%

30%

10%

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