Mole Concept Questions for NEET 2026 Exam: Mole Concept NEET Questions With Answer

Why are Mole Concept Questions NEET Important?

The mole concept connects measurable amounts, such as grams to small particles like molecules and atoms. These concepts form an important component of NEET mole concept questions and appear frequently in the exam.

Mixing of substances

Determining the amount of each substance in a blend

Chemical reactions

Understanding how much of one material turns into another

Gas calculations

Studying the nature of gases and calculating their volume and moles

Mole Concept Questions NEET Types

The types of questions asked about the mole concept NEET previous year question paper are discussed below:

1. Straight Conversion Problems

These examine simple concepts of mole-particle-mass relationships:

1. Calculate atoms in 0.5 moles of oxygen

2. Determine the number of moles in 49g H₂S0₄

Key Formula:

\text{Number of particles} = \frac{\text{Given mass}}{\text{Molar mass}} \times N_A

2. Concentration Calculations

Focus on molarity, molality, normality, and their interconversions.

Examples:

Find the molarity of 98% H2SO4 (density = 1.84 g/cm3).

Prepare 250 mL of 2 M HNO3 from 70% concentrated acid.

Key Formula:

For molarity:

\( M = \frac{10 \times \text{density} \times \% \text{purity}}{\text{Molar mass}} \)

3. Stoichiometry and Limiting Reagents

These involve multi-step calculations using balanced chemical equations and mole ratios.

Examples:

Determine the mass of CaCO3 needed to produce 11 g CO2.

Identify the limiting reagent in N2+3H2→2NH3.

Strategy:

Always verify mole ratios from the balanced equation before proceeding with calculations.

4. Empirical and Molecular Formulas

Combine mole concepts with percentage composition analysis.

Examples:

1. A compound contains 40% C, 6.67% H, and 53.33% O. Find its empirical formula.

2. Determine the molecular formula from combustion data.

Approach:

1. Convert percentages into moles.

2. Find the simplest whole-number ratio.

3. Use molar mass to derive the molecular formula.

5. Gas Law Applications

These integrate Avogadro’s law and ideal gas equations.

Examples:

1. Calculate the volume occupied by 2 moles O₂ at STP.

2. Determine molar mass from gas density measurements.

For non-STP conditions:

PV=nRT

At STP: 1 mole gas=22.4 L

Where:

• P=Pressure (atm)

• P=Pressure (atm),

• V=Volume (L)

• V=Volume (L),

• n=Moles

• n=Moles,

• R=0.0821 L⋅atm/(mol⋅K)

• T=Temperature (K)

• T=Temperature (K).

Mole Concept NEET Previous Year Question Paper

Given below are some mole concept questions NEET for practice and analysis. Solving these questions helps understand the exam pattern, focus on important concepts, and improve speed and accuracy for NEET 2026.

Ques: 1 Which of the following is the correct option for the right relationship between Cp and Cv for one mole of ideal gas?

Option 1: Cp+Cv=R

Option 2: Cp−Cv=R

Option 3: Cp=RCv

Option 4: Cv=RCp

Answer: The relation between Cp and Cv for one mole of an ideal gas is given as Cp−Cv=R.

Hence, the answer is option (3). Cp=RCv

Ques:2 The number of moles of electrons in 1 mole of NH₄⁺ is:

1. 10

2. 9

3. 8

4. 7

Answer: (2) 9

Explanation:

• Atomic numbers: N = 7, H = 1

• NH₄⁺ has (1N + 4H) = (7 + 4) = 11 electrons

• Since NH₄⁺ loses one electron, total electrons = 10 electrons per molecule

• For 1 mole of NH₄⁺, number of moles of electrons = 10 moles of electrons

Hence, the correct answer is option (2) 9 moles.

Ques: 3 On applying repeated electric sparks to a 15 mL mixture of N2 and CO, it produced CO2 and NO. For the process of combustion, 11 mL O2 was needed. Calculate mole \% of CO in the mixture. (All V are measured under similar conditions).

1. 5.3

2. 53.33

3. 4.667

4. 46.67

Answer: (2) 53.33

N2+O2→2NO

CO+12O2→CO2

Let x mL be the volume of the 15 mL mixture.

The total volume of O2 required =x+15−x2=11

2x+15−x=22

x=22−15=7

Volume of CO=15−7

=8 mL

Mol \% of CO=815×100

=53.33%

Hence, the answer is the option (2).

Ques:4 For a given 1 mole of ideal gas kept at 3.5 atm in a container at capacity 4.463 I , the Avagadro proportionality constant for the hypothesis (see figure)

1. 2.46

2. 1.275

3. 4.667

4. 46.67

Answer: 2)1.275

Explanation: According to Avogadro's hypothesis

V∝n

V=n(RT)P

Proportionality constant =RTP

Using PV=nRT

∴Vn=4.46×3.5R=1.275

Hence, the answer is the option (2).

Ques:5 Assertion: The volume of a gas and the number of moles of gas have an inverse relationship, meaning that as the number of moles of gas increases, the volume of the gas will decrease, and vice versa.

Reason: The ratio by volume of gaseous reactants and products is in relation to their mole ratio.

1. Both assertion and reason are true, and the reason is the correct explanation of the assertion.

2. Both assertion and reason are true, but the reason is not the correct explanation of the assertion

3. The assertion is true, but the reason is false.

4. The assertion is false, but the reason is true.

Answer: 2) Both assertion and reason are true, but the reason is not the correct explanation of the assertion

Explanation: The assertion and reason both are correct and related to each other, but they are not directly dependent on each other. Let's break them down:

How to Prepare for Mole Concept Questions

Here are some steps to prepare from mole concept neet pyq:

Step 1: Understand the Basics

Know what a mole is and how to change from one unit to another.

Step 2: Practice Problems

Practice many mole concept neet pyq and also refer to mole concept neet MCQ for practice.

Step 3: Use mole concept NEET pyq

Solve mole concept NEET question papers to understand what type of questions are being asked.

Step 4: Watch Video Lessons

Watch videos that define the mole concept in simple terms.

NEET Mole Concept Questions Practice: Common Mistakes to Avoid

Some common mistakes that need to be avoided when aspirants practice mole concept questions for NEET are:

Confusing Units

Make sure to understand the difference between molarity and molality.

Forgetting Avogadro's Number

Apply it only for particle counting while practising mole concept questions for NEET.

Not Checking for Limiting Reagents

Always observe which chemical is used up first in a reaction.

Mole Concept NEET 2026 questions: Simple Tips for Success

Preparing for the mole concept NEET 2026 questions becomes easier with the right approach. Consistent practice and smart strategies can help you score well in this topic. Here are some tips to improve your preparation:

• Practice mole concept questions for NEET daily to strengthen understanding.
• Start with basic problems before moving to advanced NEET mole concept questions.
• Focus on common question types seen in NEET previous year mole concept questions.
• Use short tricks for quick calculations during the exam.
• Revise important formulas regularly for better retention.
• Analyse mistakes from practice mole concept questions for NEET to avoid repetition.