Question # 1

Metals are covered by using.

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Baeyer's test

Bohr's

Electrolysis

None

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

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Cu

AgNO3

Cu(NO3)2

Ag

The most common example of corrosion is:

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Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

NaOH is prepared by ____________ of NaCL (aqueous).

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Electrolysis

Decomposition

A & B

Nil

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

It is a strong electrolyte

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H2O

CH3COOH

NaOH

C6H6

In peroxides, the oxidation no. of O is

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+1

-1

+3

-3

____________ 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

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

It is a good reducing agent

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Fe

H

C

O

CO2 the oxidation number of C =.

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+1

+2

+3

+4

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