NEET Chemistry: Mole concept Practice Questions
12 free multiple-choice questions on Mole concept (Some Basic Concepts in Chemistry) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. What is the number of elementary entities present in one mole of any substance?
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Correct answer: C — 6.022 x 10²³
One mole of any substance contains Avogadro's number of elementary entities, which is approximately 6.022 × 10²³ particles (atoms, molecules, ions, etc.).
Q2. What is the SI unit for the amount of substance?
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Correct answer: C — Mole
The SI unit for the amount of substance is the mole (mol).
Q3. The relationship between mass and the amount of substance is defined by:
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Correct answer: C — Moles
The amount of substance (moles) directly relates the mass of a substance to its molar mass (mass per mole).
Q4. The SI unit for the amount of substance is:
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Correct answer: C — mole
The SI unit for the amount of substance is the mole (mol).
Q5. If 1 mole of gas occupies 22.4 liters at STP, what is the volume occupied by 0.5 mole of the same gas?
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Correct answer: A — 11.2 liters
Since volume is directly proportional to the number of moles, half the number of moles will occupy half the volume. 0.5 mol × 22.4 L/mol = 11.2 L.
Q6. What is the molar mass of an atom of Carbon (C)? (Atomic mass of C = 12 u)
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Correct answer: C — 12 g/mol
The molar mass of an atom is numerically equal to its atomic mass expressed in atomic mass units (amu), which is conventionally expressed in g/mol. Thus, the molar mass of C is 12 g/mol.
Q7. The magnitude of one mole is defined as the amount of substance that contains 6.022 × 10²³ elementary entities. These entities are known as:
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Correct answer: B — atoms
One mole is defined by Avogadro's number, which represents the number of particles (atoms, molecules, ions) in one mole of a substance.
Q8. Which of the following represents the mass of one mole of an element?
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Correct answer: B — Molar mass (g/mol)
The mass of one mole of any substance is defined as its molar mass, expressed in grams per mole (g/mol).
Q9. Which of the following statements correctly describes the concept of the mole?
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Correct answer: D — It is the amount of substance that contains 6.022 × 10²³ particles.
The mole is the SI unit for the amount of substance. It is defined as the amount of substance that contains Avogadro's number (6.022 × 10²³) of particles.
Q10. The SI unit for the amount of substance is:
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Correct answer: C — mole
The SI unit for the amount of substance is the mole (mol).
Q11. If an object has a mass of 44 g, what is the number of moles of the substance if its molar mass is 44 g/mol?
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Correct answer: D — 1 mol
Moles are calculated by dividing the given mass by the molar mass: Moles = Mass/(Molar Mass) = (44 g)/(44 g/mol) = 1 mol.
Q12. If 1 mole of gas occupies a volume of 22.4 L at STP, what is the volume occupied by 2 moles of the same gas?
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Correct answer: B — 44.8 L
Since volume is directly proportional to the number of moles (V ∝ n), doubling the moles doubles the volume. 2 × 22.4 L = 44.8 L.
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