Class 9 Chemistry MCQ Chapter 1

_____________ revolves in orbits around nucleus.

Electron

Proton

Neutrons

Nil

The symbol of lead us

As

Pb

Sb

Na

Which one of the following element is found in most abundance in the earth’s crust?

Oxygen

Aluminum

Silicon

Iron

The study of hydrocarbons and their derived compounds is called

Physical chemistry

Inorganic chemistry

Organic chemistry

Biochemistry

The symbol of barium is:

Ba

Bi

Br

B

Number of protons+ neutrons is :

Atomic mass

Mass numbers

Both

Nil

positive ion hare formed by _________ of electrons.

Gain

Loss

Sharing

Bonding

The period of Alchemists extends from _________ AD.

800 to 1800

600 to 1600

900 to 1900

700 to 1700

One amu (atomic mass unit) is equivalent to:

1.66×10-24 mg

1.66x 10-24g

1.66×10 g

1.66×10-23mg

All of the following are tri-atomic molecules except:

H2

O3

H2O

CO2