9th Class Chemistry MCQs

The Molecule consist of two atoms is:

1. Monoatomic molecule
2. Polyatomic molecule
3. Hetero atomic molecule
4. Diatomic molecule

A formula that indicates actual number and type of atoms in a molecule is called?

1. Chemical formula
2. Empirical formula
3. Molecular formula
4. Formula mass

Ethyl alcohol was prepared by:

1. Ibne-Sina
2. Al-Razi
3. Al-Beruni
4. Jaber bin-Hayan

Which of the following is a homo atomic?

1. H2
2. NH3
3. H2O
4. CO2

The Empirical formula of hydrogen peroxide is:

1. H2O2
2. HO
3. OH
4. O2H2

A piece of matter in pure form is termed as:

1. Redical
2. Mixture
3. Compound
4. Substance

In an atom number of protons and neutrons are added to obtain:

1. Number of electrons
2. Number of nucleons
3. Atomic number of element
4. Number of isotopes

If proton number is 19, electron configuration will be:

1. 2, 8, 9
2. 2, 8, 8, 1
3. 2, 8, 1
4. 2, 8, 3

If nucleon number of potassium is 39, number of neutrons will be:

1. 39
2. 19
3. 20
4. 29

The isotope C-12 is present in abundance of:

1. 96.9%
2. 97.6%
3. 98.8%
4. 99.7%