Mole Concept JEE Questions PDF with Solution, Practice Now

Mole Concept JEE Questions: The mole concept is one of the most basic yet very important topics in Chemistry. It forms the foundation of physical chemistry and is the key to solving numerical problems in almost every chapter. In the JEE Main and JEE Advanced exams, the mole concept plays a vital role because it helps students connect atomic-level calculations with real, measurable quantities. Whether it is balancing equations, calculating moles, or solving stoichiometry problems, a clear understanding of this topic makes problem-solving much easier.

In JEE Main, one to two direct questions are usually asked every year from the mole concept. In JEE Advanced, questions are often asked in the form of tricky stoichiometry problems where students need to apply concepts carefully. This makes practicing mole concept JEE questions and JEE Advanced stoichiometry problems very important for scoring well. Since many other chemistry chapters depend on it, this chapter becomes a stepping stone for mastering the subject.

Mole Concept JEE Questions Overview

The mole concept connects the world of atoms, molecules, and particles with measurable mass and volume. It allows us to calculate the number of entities in a substance, balance chemical reactions, and find limiting reagents. The JEE Main exam pattern often includes numerical value-type questions and multiple-choice questions from this chapter. Most of these problems test accuracy, speed, and a clear understanding of Avogadro’s number, molar mass, empirical formulas, and equivalent concept.

Mole Concept JEE Questions are usually direct and formula-based, while in JEE Advanced, the problems are conceptual and involve multiple steps. Students who practice important mole concept JEE Main previous year questions regularly develop strong calculation skills and become comfortable with applying formulas in different ways. This is why teachers always suggest that the mole concept should be revised again and again during preparation.

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Practice Mole Concept JEE Questions

Let us look at some practice Mole Concept JEE Questions problems that follow the JEE exam pattern.

Single Correct Type Questions

1. The density of a 2.0 M solution of acetic acid in water is 1.01 g cm⁻³. The molality of acetic acid in solution is:

(A) 2.12 mol kg⁻¹
(B) 2.24 mol kg⁻¹
(C) 2.50 mol kg⁻¹
(D) 3.0 mol kg⁻¹

2. A 6.977 g sample of a mixture was analysed for barium ion by adding a small excess of sulphuric acid to an aqueous solution of the sample. The resultant reaction produced a precipitate of barium sulphate, which was collected by filtration, washed, dried and weighed. If 0.4123 g of barium sulphate was obtained, what was the mass percentage of barium in the sample?

(A) 6.95%
(B) 3.476%
(C) 4.376%
(D) 1.738%

3. In the reaction,
2Al (s) + 6HCl (aq) → 2Al³⁺ (aq) + 6Cl⁻ (aq) + 3H₂(g)

(A) 33.6 L H₂ (g) is produced regardless of temperature and pressure for every mole Al that reacts
(B) 67.2 L H₂ (g) at STP is produced for every mole Al that reacts
(C) 11.2 L H₂ (g) at STP is produced for every mole HCl (aq) consumed.
(D) 6 L HCl (aq) is consumed for every 3L H₂ (g) produced.

4. Dissolving 180 g of glucose (mol. wt. 180) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solution is:

(A) 1.78 M
(B) 2.00 M
(C) 0.97 M
(D) 2.22 M

5. The number of sodium atoms in 2 moles of sodium ferrocyanide (Na₄[Fe(CN)₆]) is (Nₐ = 6 × 10²³):

(A) 12 × 23
(B) 26 × 10²³
(C) 34 × 10²³
(D) 48 × 10²³

6. A person adds 1.71 gram of sugar (C₁₂H₂₂O₁₁) in order to sweeten his tea. The number of carbon atoms added are (molecular mass of sugar = 342, Nₐ = 6 × 10²³)

(A) 3.60 × 10²²
(B) 7.20 × 10²²
(C) 1.20 × 10²³
(D) 2.40 × 10²³

7. Which of the following samples does not contain 8 g of carbon atoms?

(A) 20 g glucose (C₆H₁₂O₆)
(B) 9.5 g sucrose (C₁₂H₂₂O₁₁)
(C) 40 g urea (NH₂CONH₂)
(D) 62/3 g ethylene glycol

8. If in a hypothetical universe, the mass of a proton is half of its original value, and the mass of a neutron is 1/4th of its original value. Calculate the molecular mass of NaOH in a hypothetical universe.

(A) 10 u
(B) 15 u
(C) 20 u
(D) None of these

9. The weight percent of sucrose (formula weight = 342 g mol⁻¹) in an aqueous solution is 3.42% (W/W). The density of the solution is 1 g mL⁻¹, the concentration of sucrose in the solution in mol L⁻¹ (M) is:

(A) 0.01 M
(B) 0.1 M
(C) 1.0 M
(D) 10 M

10. 5.6 L of a gaseous alkane at STP, one molecule of which contains 6 H-atoms, is allowed to burn in presence of 80 g air (containing 20% oxygen gas by mass). The maximum mass of CO₂ that can be produced is:

(A) 22 g
(B) 12.57 g
(C) 1.257 g
(D) None of these

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Mole Concept JEE Questions PDF with Solution

PW has created a special Mole Concept JEE Questions PDF with Solutions to help students practice more effectively. This PDF contains solved mole concept JEE Mains questions, tricky JEE Advanced stoichiometry problems, and all important mole concept PYQs arranged in a systematic manner. Each question is explained with detailed steps so that students can understand the concept as well as the method. By using this PDF, students can practice at home and build their confidence before the exam.