Free daily NEET & JEE PYQs, quizzes & mock tests on TelegramJoin free →

NEET Chemistry: Molar mass Practice Questions

14 free multiple-choice questions on Molar mass (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 →

  1. Q1. The molar mass of water (H₂O) is approximately 18 g/mol. If 36 grams of water are present, how many moles of water are present?

    • A2 moles
    • B3 moles
    • C1 mole
    • D18 moles
    Show answer & explanation

    Correct answer: A — 2 moles

    Moles can be calculated by dividing the given mass by the molar mass. Moles = Mass / Molar Mass = 36 g / 18 g/mol = 2 moles.

  2. Q2. The value of Avogadro's number (N_A) is approximately:

    • A6.022 × 10²³ mol
    • B6.022 × 10²³ g/mol
    • C6.022 × 10²³ kg
    • D6.022 × 10²³
    Show answer & explanation

    Correct answer: A — 6.022 × 10²³ mol

    Avogadro's number (N_A) is the number of particles that make up one mole, meaning 1 mol of any substance contains 6.022 × 10²³ particles.

  3. Q3. If the atomic mass of Carbon (C) is 12 u and the atomic mass of Oxygen (O) is 16 u, what is the molar mass of water (H₂O), assuming the mass of Hydrogen is 1 u?

    • A19 u
    • B32 u
    • C18 u
    • D12 u
    Show answer & explanation

    Correct answer: C — 18 u

    Molar mass of H₂O = (2 × 1) + 16 = 18 u. This value corresponds to 18 g/mol in standard units.

  4. Q4. What does the term 'mole' represent in the context of molar mass?

    • AThe mass of one gram
    • BThe mass of one atom
    • CThe amount of substance that contains Avogadro's number of particles
    • DThe energy content of a substance
    Show answer & explanation

    Correct answer: C — The amount of substance that contains Avogadro's number of particles

    The mole is the SI unit for the amount of substance, which is defined as the number of particles (atoms, molecules, ions) present in 6.022 × 10²³ entities.

  5. Q5. The molar mass of an element is numerically equal to its atomic mass unit (amu). Which SI unit is used for expressing molar mass?

    • AKilogram per mole (kg/mol)
    • BAtomic mass unit (amu)
    • CGram per mole (g/mol)
    • DNewton (N)
    Show answer & explanation

    Correct answer: C — Gram per mole (g/mol)

    The standard unit for expressing molar mass is gram per mole (g/mol). While atomic mass is in amu, molar mass is expressed in mass units per mole.

  6. Q6. If a compound has a molar mass of 50 g/mol, what does this value signify?

    • AThe mass of 50 moles of the compound
    • BThe mass of 50 particles
    • CThe mass of 50 grams of the compound
    • DThe mass of 1 mole of the compound
    Show answer & explanation

    Correct answer: D — The mass of 1 mole of the compound

    A molar mass of 50 g/mol means that one mole of this substance has a mass of 50 grams.

  7. Q7. Which of the following quantities is numerically equal to the molar mass of an element?

    • AThe density of the element
    • BThe mass of one mole of particles
    • CThe mass of one mole of atoms
    • DThe atomic mass of the element
    Show answer & explanation

    Correct answer: C — The mass of one mole of atoms

    The molar mass (in g/mol) is numerically equal to the mass of exactly one mole of that element (in grams).

  8. Q8. What is the SI unit for the molar mass of an element?

    • Agram per mole (g/mol)
    • Bkilogram per mole (kg/mol)
    • Cjoule per mole (J/mol)
    • Datomic mass unit (amu)
    Show answer & explanation

    Correct answer: A — gram per mole (g/mol)

    The SI unit for molar mass is gram per mole (g/mol).

  9. Q9. Which of the following statements is true regarding the relationship between mass and moles?

    • AMass is inversely proportional to the number of moles.
    • BMoles are directly proportional to the volume occupied by the substance at constant temperature.
    • CMass is directly proportional to the number of moles.
    • DMoles are inversely proportional to mass.
    Show answer & explanation

    Correct answer: C — Mass is directly proportional to the number of moles.

    Molar mass (M) is the bridge between mass (m) and moles (n): m = n × M. Thus, mass is directly proportional to the number of moles.

  10. Q10. If a substance has a molar mass of 44 g/mol, how many grams correspond to 2 moles of this substance?

    • A11 g
    • B44 g
    • C22 g
    • D88 g
    Show answer & explanation

    Correct answer: D — 88 g

    Mass = Molar Mass × Number of Moles. Mass = 44 g/mol × 2 mol = 88 g.

  11. Q11. If the atomic mass of Carbon (C) is approximately 12 amu, what is its molar mass in grams?

    • A120 g/mol
    • B1200 g/mol
    • C12 g/mol
    • D1.2 g/mol
    Show answer & explanation

    Correct answer: C — 12 g/mol

    The molar mass of an element is numerically equal to its atomic mass, expressed in units of g/mol. Therefore, Molar mass of C = 12 g/mol.

  12. Q12. Which of the following terms is a measure of the amount of substance?

    • AMole
    • BMass
    • CMolar Mass
    • DDensity
    Show answer & explanation

    Correct answer: A — Mole

    The mole is the SI unit for the amount of substance. It is the fundamental quantity used in stoichiometry to relate mass and the number of particles.

  13. Q13. The molar mass of an atom is defined in terms of which unit?

    • Agram (g)
    • Bmole (mol)
    • Ckilogram (kg)
    • Datomic mass unit (amu)
    Show answer & explanation

    Correct answer: D — atomic mass unit (amu)

    The atomic mass unit (amu) is the fundamental unit used to express the mass of individual atoms and elements.

  14. Q14. The SI unit for the amount of substance is the mole. What physical quantity does one mole represent?

    • ANumber of atoms
    • BTotal energy
    • CMass of one atom
    • DAmount of matter
    Show answer & explanation

    Correct answer: D — Amount of matter

    The mole is the SI unit for the amount of substance, representing a specific macroscopic quantity of particles.

Keep going — practice on Padhai Karlo

Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.

Get the free Android app →

More Some Basic Concepts in Chemistry topics

← All Some Basic Concepts in Chemistry practice