Question # 1

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

____________ of copper is done by electrolysis.

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Production

Refining

Both

Nil

By electrolytic refining of copper , it is ____________ % pure.

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98

99

99.99

100

CO2 the oxidation number of C =.

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+1

+2

+3

+4

Cu + 2AgNO3 -------> Cu(NO3) +2Ag. In this reaction reducing agent is:

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Cu

AgNO3

Cu(NO3)2

Ag

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

Which one of the following is not an electrolytic cell:

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Down cell

Galvanic cell

Nelson' cell

Both a and c

It is a strong electrolyte

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H2O

CH3COOH

NaOH

C6H6

Gain of electrons in a reaction is called ____________reaction.

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Oxidation

Reduction

Both

Nil

Brine is an aqueous solution of

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NaCI

NaOH

AgNO3

CaO

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