Question # 1

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

____________ of copper is done by electrolysis.

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Production

Refining

Both

Nil

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

Addition of OXYGEN is called.

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Reduction

Conduction

Oxidation

Nil

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

Oxidation means

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Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons

All electrolytes are:

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Conductor

Insulator

Semi conductor

Nil

In silver plating Anode is made of:

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Gold

Ag

Neon

Nil

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

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98

99

99.99

100

The formula of rust is:

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Fe₂O₃,nH₂o

Fe₂O₃

Fe(OH)₃-nH₂O

Fe(OH)₃

The cathode of Nelson's cell is made up of

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C

Zn

Cu

Fe

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

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