Class 9 Chemistry MCQ Chapter 9

____________ do not conduct electricity.

Electrolyte

Non-electrolyte

Both

Nil

The metallic plates through which electrons enters and leaves electrolytes:

Wires

Electrodes

Both

Nil

Brine is an aqueous solution of

NaCI

NaOH

AgNO3

CaO

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

Hydrogen has oxidized

oxygen has reduced

oxygen gains electrons

hydrogen behaves as oxidizing agent

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

Biochemistry

Electrochemistry

Organic chemistry

None of these

____________ of copper is done by electrolysis.

Production

Refining

Both

Nil

The most common example of corrosion is:

Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

____________ is prevented by Metallic coating.

NaCl

Rust

All

None of these

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

zn

H+

C

H2

Oxidation means

Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons