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Basic Concepts of Chemistry - Set 1

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NUST Entrance Test
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Basic Concepts of Chemistry

Set 1

MM

Mashaal Masha

Oct 16, 2022

Table of Contents

Choose the correct options for the following questions.

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as:

Difficulty: Easy

A:

Chemistry

B:

Geology

C:

Physics

D:

Mechanics

Smallest particle of an element which may or may not have independent existence is known as:

Difficulty: Easy

A:

A molecule

B:

An ion

C:

An atom

D:

An electron

Smallest particle of an element which may or may not have independent existence is known as:

Difficulty: Easy

A:

A molecule

B:

An ion

C:

An atom

D:

An electron

The number of atoms present in a molecule determines its :

Difficulty: Easy

A:

Molecularity

B:

Atomicity

C:

Basicity

D:

Acidity

The number of atoms present in a molecule determines its :

Difficulty: Easy

A:

Molecularity

B:

Atomicity

C:

Basicity

D:

Acidity

$CO^{+}$ is an example of

Difficulty: Easy

A:

Stable molecule

B:

Anionic

C:

Cationic molecular ion

D:

Free radical

The diameter of atoms is of the order

Difficulty: Easy

A:

2\times10^{-5}

B:

2\times10^{-10}

C:

2\times10^{-2}

D:

2\times10^{-3}

Swedish chemist J.Berzelius determined:

Difficulty: Easy

A:

Atomic destiny

B:

Atomic number

C:

Atomic mass

D:

Atomic volume

Covalent compounds mostly exist in the form of :

Difficulty: Easy

A:

Protons

B:

Atoms

C:

Neutrons

D:

Molecules

Atoms and molecules can either gain or lose electrons, forming charged particles called:

Difficulty: Easy

A:

Positrons

B:

Photons

C:

Ions

D:

Electrons