Question # 1

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

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98

99

99.99

100

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

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

CO2 the oxidation number of C =.

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+1

+2

+3

+4

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

Addition of OXYGEN is called.

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Reduction

Conduction

Oxidation

Nil

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

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Cu

AgNO3

Cu(NO3)2

Ag

In peroxides, the oxidation no. of O is

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+1

-1

+3

-3

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

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