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NDA Mole Concept and States of Matter questions with solutions

Moles, solutions and gases. 13 questions from our 2016–2025 NDA pattern papers, from the Class 11 Chemistry syllabus. Each has the answer and a full solution.

Also practise: Mole Concept and States of Matter for JEE Main · Mole Concept and States of Matter for JEE Advanced

NDA 2025

The number of atoms present in 9 g of water is (N_A is Avogadro's number)NDA 2025 GAT · hard
What is the mass of 0.25 mole of calcium carbonate, CaCO3? (Atomic masses: Ca = 40, C = 12, O = 16)NDA 2025 GAT · hard

NDA 2024

Laughing gas, used as a mild anaesthetic, is chemicallyNDA 2024 GAT · medium
The number of atoms present in 0.5 mole of ozone (O₃) molecules isNDA 2024 GAT · medium
4 g of NaOH (molar mass 40 g/mol) is dissolved in water to make 500 mL of solution. The molarity of the solution isNDA 2024 GAT · hard

NDA 2023

During DNA replication, the enzyme that unwinds the double helix by breaking hydrogen bonds between the bases isNDA 2023 GAT · hard

NDA 2021

The number of moles present in 11 g of carbon dioxide (C = 12, O = 16) isNDA 2021 GAT · hard
Nucleic acids: 1. DNA contains the nitrogenous base thymine. 2. RNA contains the nitrogenous base uracil in place of thymine.NDA 2021 GAT · medium

NDA 2020

The number of oxygen atoms in 0.5 mole of oxygen gas (O2) is (Avogadro number = 6.022 x 10^23)NDA 2020 GAT · hard

NDA 2019

Contains the greatest number of atoms? (Atomic masses: H = 1, He = 4, N = 14, O = 16)NDA 2019 GAT · hard

NDA 2018

The volume occupied by 2 moles of an ideal gas at STP isNDA 2018 GAT · medium

NDA 2017

The number of hydrogen atoms in 2 g of hydrogen gas (H2) is (Avogadro number N = 6.022 x 10^23)NDA 2017 GAT · hard

NDA 2016

The number of molecules in 4.4 g of carbon dioxide is (Avogadro number = 6.022 × 10²³; atomic masses C = 12, O = 16)NDA 2016 GAT · hard

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