Chemistry · JEE

Important Questions: Some Basic Concepts in Chemistry for JEE

36+ syllabus-aligned questions available

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The most important Some Basic Concepts in Chemistry questions for JEE cover conceptual traps, standard results, and numerical patterns from Matter and its nature, Dalton's atomic theory, Concept of atom, molecule, element and compound, Laws of chemical combination, Atomic and molecular masses, Mole concept, molar mass, percentage composition, empirical and molecular formulae, and more. Goodmarks provides 36+ high-yield MCQs with full solutions.

Focus on what matters most. These important Some Basic Concepts in Chemistry questions cover high-weightage concepts from Matter and its nature, Dalton's atomic theory, Concept of atom, molecule, element and compound, Laws of chemical combination, Atomic and molecular masses, Mole concept, molar mass, percentage composition, empirical and molecular formulae, and more — the topics JEE repeats every year.

Subtopics in Some Basic Concepts in Chemistry

Matter and its nature, Dalton's atomic theory
Concept of atom, molecule, element and compound
Laws of chemical combination, Atomic and molecular masses
Mole concept, molar mass, percentage composition, empirical and molecular formulae
Chemical equations and stoichiometry

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Q1ChemistryUnit 1: Some Basic Concepts in Chemistry

Volume of

N_{2},

in litres, liberated on heating 6.4 g of

N H_{4} N O_{2}

is:

Q2ChemistryUnit 1: Some Basic Concepts in Chemistry

What is the physical state of

\boldsymbol{P} \boldsymbol{C l}

late under normal condition?

Q3ChemistryUnit 1: Some Basic Concepts in Chemistry

Assertion Element can form different compound. Reason Any substance that contains only one kind of an atom is known as an element.

Q4ChemistryUnit 1: Some Basic Concepts in Chemistry

What is the density of wet air with

75 \%

relative humidity at 1 atm and

300 \mathrm{K}

? Given : vapour pressure of

H_{2} O

is 30 torr and average molar mass of air is

29 g / m o l

Q5ChemistryUnit 1: Some Basic Concepts in Chemistry

Which of the following is a true solution?

Q6ChemistryUnit 1: Some Basic Concepts in Chemistry

10 \mathrm{L}

of hard water required

0.56 \mathrm{g}

of lime (CaO) for removing hardness. Hence, the temporary hardness in ppm (part per million) of

C a C O_{3}

is :

Q7ChemistryUnit 1: Some Basic Concepts in Chemistry

Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. This law is popularly known as:

Q8ChemistryUnit 1: Some Basic Concepts in Chemistry

What are the materials which contain at least two pure substances and show the properties of their constituents called?

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Frequently asked questions

What makes a Some Basic Concepts in Chemistry question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Some Basic Concepts in Chemistry are high-weightage?

Key areas include Matter and its nature, Dalton's atomic theory, Concept of atom, molecule, element and compound, Laws of chemical combination, Atomic and molecular masses, Mole concept, molar mass, percentage composition, empirical and molecular formulae, and more. Prioritise these before moving to edge cases.

How many important questions should I revise?

Revise 30–50 important MCQs per unit in the last month before JEE. Focus on questions you got wrong at least once.

Can I practise only important questions on Goodmarks?

Pro users can filter by unit and subtopic to target high-yield areas. Free users can attempt sample questions on this page.