Question # 1

Spontaneous chemical reactions take place in:

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electrolytic cell

Galvanic cell

Nelson' s cell

downs cell

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

Formation of water form hydrogen and oxygen is:

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Redox reaction

Acid-base reaction

Neutralization

Decomposition

The branch of chemistry which deals with inter conversion of electrical & chemical energy is:

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Biochemistry

Electrochemistry

Organic chemistry

None of these

Gain of electrons in a reaction is called ____________reaction.

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Oxidation

Reduction

Both

Nil

____________ agents gains electrons in chemical reaction.

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Reduction

Oxidation

Both

None of these

The oxidation number of chromium in K₂Cr₂O₇ is:

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+2

+6

+7

+14

____________ are good conductors of electricity.

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Covalent compound

Metals

Both

None of these

____________ cell is made of two half of cells.

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Zinc cell

Galvanic

Both

All

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

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