Chemistry · JEE

Important Questions: Chemical equations and stoichiometry for JEE

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The most important Chemical equations and stoichiometry questions for JEE cover conceptual traps, standard results, and numerical patterns from Chemical equations and stoichiometry. Goodmarks provides 8+ high-yield MCQs with full solutions.

Focus on what matters most. These important Chemical equations and stoichiometry questions cover high-weightage concepts from Chemical equations and stoichiometry — the topics JEE repeats every year.

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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

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 :

Q3ChemistryUnit 1: Some Basic Concepts in Chemistry

\mathbf{2} \boldsymbol{C} \boldsymbol{a}_{3}\left(\boldsymbol{P} \boldsymbol{O}_{4}\right)_{2}+\boldsymbol{6} \boldsymbol{S} \boldsymbol{i} \boldsymbol{O}_{2}+\mathbf{1 0} \boldsymbol{C} \rightarrow \boldsymbol{P}_{4}+

\boldsymbol{C a} \boldsymbol{S i O}_{3}+\mathbf{1 0 C O}

Which coefficient balances the reaction given above?

Q4ChemistryUnit 1: Some Basic Concepts in Chemistry

Consider the four statements below concerning limiting reactants in chemical systems. Identify the one that correctly describes the role of the limiting reactant.

Q5ChemistryUnit 1: Some Basic Concepts in Chemistry

What is the correct formula for calcium chloride?

Q6ChemistryUnit 1: Some Basic Concepts in Chemistry

Which of the following rules regarding the significant figures and calculations involving them is not correct?

Q7ChemistryUnit 1: Some Basic Concepts in Chemistry

Round 984 liters to 2 significant digits.

Q8ChemistryUnit 1: Some Basic Concepts in Chemistry

10 \mathrm{ml}

\mathrm{CO}

is mixed with

25 \mathrm{ml}

air having 20 per cent

O_{2}

by volume. What would be the final volume if none of

\mathrm{CO}

and

O_{2}

is left after the reaction?

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Frequently asked questions

What makes a Chemical equations and stoichiometry 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 Chemical equations and stoichiometry. 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.