Basic Concepts of Chemistry MCQs

Boost your preparation with Basic Concepts of Chemistry MCQs, featuring concept-based questions, detailed explanations, and exam-focused practice to strengthen fundamentals and improve performance in entry tests and competitive exams. Chemistry is the study of the composition, properties, and interactions of matter. It connects with other branches of science, and its principles are widely applied. To better understand chemistry, there are fundamental concepts such as the states of matter, their nature, physical and chemical properties, moles and molar mass, composition, and various basic laws like Avogadro’s law and Dalton’s theory. Below are some questions related to these basic concepts of chemistry that are important for NEET.

Which one will have the maximum number of water molecules?

(a) 18 molecules of water
(b) 1.8 grams of water
(c) 18 grams of water
(d) 18 moles of water

Which of the species is not paramagnetic?

(a) As⁺
(b) Cl^–
(c) Ne2⁺
(d) Be⁺

Elements X and Y combine to form two compounds XY and X2Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X2Y is 9g

(a) 30, 20
(b) 80, 20
(c) 60, 40
(d) 20, 30

Boron exists as two stable isotopes; 10B (19%) and 11B (81%). Find out the average atomic weight of boron in the periodic table

(a) 10.0
(b) 11.2
(c) 10.2
(d) 10.8

There are two chlorides of sulphur S2Cl2 and SCl2. What is the equivalent mass of S in SCl2

(a) 64.8 g/mole
(b) 32 g/mole
(c) 16 g/mole
(d) 8 g/mole

The number of atoms present in 0.1 moles of a triatomic gas is

(a) 1.806 × 10²³
(b) 1.806 × 10²²
(c) 3.600 × 10²³
(d) 6.026 × 10²²

A container has an equal mass of H2, O2, and CH4 at 27℃, the ratio of their volume is

(a) 16:8:1
(b) 8:1:2
(c) 16:1:2
(d) 8:16:1

Find the volume of O₂ required to burn 1 L of propane completely, measured at 0℃ temperature and 1 atm pressure

(a) 10 L
(b) 7 L
(c) 6 L
(d) 5 L

Pressure has the same dimension as __

(a) energy per unit volume
(b) energy
(c) force per unit volume
(d) force

A gas X has Cp and Cv ratio as 1.4, at NTP 11.2 L of gas X will contain_______ number of atoms

(a) 1.2 × 10²³
(b) 3.01 × 10²³
(c) 2.01 × 10²³
(d) 6.02 × 10²³