Avogadro's Number NEET Questions

Physics - Kinetic Theory of Gases

Avogadro's Number MCQ Questions


7.
Avogadro's hypothesis states that equal volumes of all gases at equal temperature and pressure have:
A.
The same density
B.
The same molecular speed
C.
The same mass
D.
The same number of molecules
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ANSWER :
D. The same number of molecules
8.
Avogadro's hypothesis was first proposed to explain:
A.
Dalton's law of partial pressures
B.
Boyle's law of pressure-volume relation
C.
Gay Lussac's law of combining volumes of gases
D.
Charles' law of temperature-volume relation
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ANSWER :
C. Gay Lussac's law of combining volumes of gases
9.
The number of moles µ of a gas is related to the total number of molecules N and Avogadro's number NA by:
A.
µ = N / NA
B.
µ = N + NA
C.
µ = NA / N
D.
µ = N × NA
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ANSWER :
A. µ = N / NA
10.
The molar mass M₀ of a substance is related to the mass m of one molecule and Avogadro's number NA by:
A.
M₀ = NA × m
B.
M₀ = NA + m
C.
M₀ = m / NA
D.
M₀ = NA / m
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ANSWER :
A. M₀ = NA × m
11.
The mass of a single water molecule, given that 1 mole of water (18 g) contains NA = 6 × 10²³ molecules, is approximately:
A.
6 × 10⁻²⁶ kg
B.
3 × 10⁻²⁶ kg
C.
3 × 10⁻²³ kg
D.
18 × 10⁻²³ kg
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ANSWER :
B. 3 × 10⁻²⁶ kg
12.
Kinetic theory is said to justify Avogadro's hypothesis because it shows that from PV = NkBT, at fixed P, V, T:
A.
N depends on the pressure of the gas only
B.
N depends on the molecular mass of the gas
C.
N is greater for lighter gases
D.
N is the same for all gases regardless of their nature
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ANSWER :
D. N is the same for all gases regardless of their nature