Class 9 Chemistry MCQ Chapter 7

Br2 + H2S __ 2HBr + S, which one is oxidizing agent:

H2S

Br2

S

2HBr

Which one of the following is not an electrolyte?

sugar solution

sulphuric acid solution

Lime solution

Sodium chloride solution

The cathode of Daniel cell is made up of

Zn

Cu

AI

C

____________ agents gains electrons in chemical reaction.

Reduction

Oxidation

Both

None of these

Gases produced in Nelson’s cell are:

H2 and O2

H2 and CI2

H2 and N2

CI2 and O2

In peroxides, the oxidation no. of O is

+1

-1

+3

-3

____________ is prevented by Metallic coating.

NaCl

Rust

All

None of these

The most common example of corrosion is:

Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

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

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

zn

H+

C

H2