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Mole Concept Questions

Practice 32 Mole Concept questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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32
Total Questions
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6
Easy
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21
Medium
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5
Hard
Practice by Exam:Chemistry(28)Mathematics and Science(3)CHEMISTRY(1)

About Mole Concept — practice questions, PYQs & concepts

Mole Concept is a frequently-tested topic on Chemistry, Mathematics and Science, CHEMISTRY. ExamTest.live currently lists 32 Mole Concept questions spanning previous-year papers from 2017 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Mole Concept weight in competitive exams

Across our Mole Concept question bank, the largest sources are Chemistry (28), Mathematics and Science (3) and CHEMISTRY (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 6 easy Mole Concept questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
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  • Read every explanation: Even on questions you got right — the explanation often surfaces a faster approach you can reuse.

All Mole Concept Questions(1–32 of 32)

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Q1mediummcqChemistryAIEEE2026
0% accuracy
If we consider that in place of mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:
Q2mediummcqChemistryWBCS Prelims2026
0% accuracy
How many grams of are needed to make of a solution of ? (Atomic weight: , , )
Q3mediummcqChemistryIndian Competitive Exam Prep2026
0% accuracy
If of gas has ' ' number of molecules, how many molecules are present in of gas?
Q4mediummcqChemistryAIEEE 20062026
0% accuracy
How many moles of magnesium phosphate, will contain of oxygen atoms?
Q5mediummcqChemistryNEET (UG) 20182026
In which case is the number of molecules of water maximum?
Q6mediummcqChemistryCompetitive Exam2026
What is the weight of one mole Carbon atoms?
Q7mediummcqChemistryGeneral Awareness2026
Atomic mass of Oxygen is 16 and atomic number is 8. What is the mass in grams of 2 moles of oxygen gas?
Q8easymcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2026
Number of moles in of will be
Q9easymcqChemistrySSC CGL2026
What is the ratio by mass of hydrogen and oxygen in water?
Q10mediummcqChemistryNEET (UG) 20242026
The highest number of helium atoms is in:
Q11mediummcqChemistryNEET 20232026
The mass of produced by heating of pure limestone is:(Atomic mass of )
Q12hardmcqChemistryNEET 20222026
What mass of pure will be required to neutralise of solution according to the following reaction?
Q13mediummcqChemistryNEET 2020 E12026
Which one of the followings has maximum number of atoms?
Q14mediummcqCHEMISTRYNEET 20192026
The density of a aqueous solution of is . The molality of the solution is: [molecular mass of ]
Q15hardmcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
Which of the following has maximum number of atoms?
Q16hardmcqMathematics and ScienceUPTET Paper 2 (Maths & Science)2017
Which of the following has the maximum number of atoms?
Q17mediummcqChemistryChemistry
2% accuracy
Among the following, choose the ones with equal number of atoms:A. of () [molar mass = ]B. of () [molar mass = ]C. of () [molar mass = ]D. of () [molar mass = ]E. of () [molar mass = ]Choose the correct answer from the options given below:
Q18mediummcqChemistryChemistry
Which has the maximum number of molecules among the following?
Q19mediummcqChemistryChemistry
What volume of oxygen gas () measured at and , is needed to burn completely of propane gas () measured under the same conditions?
Q20mediummcqChemistryChemistry
How many moles of lead (II) chloride will be formed from a reaction between of and of ?
Q21easymcqChemistryChemistry
Volume occupied by one molecule of water (density ) is:
Q22mediummcqChemistryChemistry
of hydrogen and of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be:
Q23mediummcqChemistryChemistry
of sodium carbonate, is dissolved in enough water to make of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, and carbonate ions, are respectively: (Molar mass of )
Q24easymcqChemistryChemistry
The number of atoms in of a triatomic gas is ():
Q25hardmcqChemistryChemistry
of a magnesium carbonate sample decomposes on heating to give carbon dioxide and magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight: , , )
Q26mediummcqChemistryChemistry
How many grams of concentrated nitric acid solution (70% by mass) should be used to prepare of ?
Q27easymcqChemistryChemistry
molecules of urea are present in of its solution. The concentration of the solution is:
Q28mediummcqChemistryChemistry
When of is mixed with of , each at S.T.P., the moles of formed is equal to:
Q29mediummcqChemistryChemistry
of magnesium is burnt with in a closed vessel. Which reactant is left in excess and by how much? (At. wt. )
Q30easymcqChemistryChemistry
The number of water molecules is maximum in:
Q31mediummcqChemistryChemistry
If Avogadro number , is changed from to , this would change:
Q32hardmcqChemistryChemistry
What is the mass of the precipitate formed when of solution of is mixed with of solution?

Frequently Asked Questions

How many Mole Concept questions are on ExamTest.live?▼
We have 32 Mole Concept questions spread across 1 pages, covering easy, medium, and hard difficulty levels with detailed explanations.
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Which exams include Mole Concept questions?▼
Mole Concept questions are commonly asked in Chemistry, Mathematics and Science, CHEMISTRY. You can filter by exam using the links above.
How do I practice Mole Concept questions effectively?▼
Start with easy questions to build confidence, then tackle medium and hard ones. Use the filter buttons to sort by difficulty. Reveal the answer only after attempting each question, and read the explanation thoroughly.