Question # 1

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

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

Films are coated by special chemical known as ____________ detectors.

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Photographic

Image

Nil

Both

NaOH is prepared by ____________ of NaCL (aqueous).

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Electrolysis

Decomposition

A & B

Nil

In metal hydrides, the oxidation number of hydrogen is

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+1

-1

+2

-2

____________ do not conduct electricity.

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Electrolyte

Non-electrolyte

Both

Nil

Spontaneous chemical reactions take place in:

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electrolytic cell

Galvanic cell

Nelson' s cell

downs cell

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

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

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98

99

99.99

100

Which one of the following is not an electrolytic cell:

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Down cell

Galvanic cell

Nelson' cell

Both a and c

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

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