Question # 1

Spontaneous chemical reactions take place in:

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electrolytic cell

Galvanic cell

Nelson' s cell

downs cell

Oxidation means

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Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

Electrolyte is ____________ solid form.

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in

Sometimes in

Never in

Always in

____________ of copper is done by electrolysis.

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Production

Refining

Both

Nil

Which one is strong electrolyte ?

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NH4OH

NaOH

a & b

Nil

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

During the formation of water from hydrogen and oxygen, which of the following does not occur?

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Hydrogen has oxidized

oxygen has reduced

oxygen gains electrons

hydrogen behaves as oxidizing agent

In the redox reaction between zn and HCI. the oxidizing agent is:

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zn

H⁺

C

H²

Brine is an aqueous solution of

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NaCI

NaOH

AgNO3

CaO

All electrolytes are:

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Conductor

Insulator

Semi conductor

Nil

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