Gases: Avogadro's Law - MCQs with Answers

Q1. What is a mole of a substance?

a. one mole has a mass numerically equal to half the molecular weight of the substance

b. one mole has a mass numerically equal to the molecular weight of the substance

c. one mole has a mass numerically equal to double the molecular weight of the substance

d. none of the above

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Q2. According to the Avogadro's law, what is the relation between volume of 1 kg mol of oxygen and volume of 1 kg mol of nitrogen, at normal pressure and temperature? ( mass of 1 kg mol of oxygen is 32 kg and mass of 1 kg mol of nitrogen is 28 kg)

a. volume of 1 kg mol of oxygen is greater than that of nitrogen
b. volume of 1 kg mol of oxygen is less than that of nitrogen
c. volume of 1 kg mol of oxygen is same as that of nitrogen
d. none of the above

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Q3. What is the volume of a gram mole of hydrogen at 760 mm Hg and 0 °C ?

a. 22.4 cm³
b. 22.4 liters
c. 22.4 m³
d. none of the above

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Q4. What is the formula for number of kg moles (n) of a gas?
If,
m = mass of gas in kg
μ = molecular weight in kg / kg mole

a. n = m . μ
b. n = m / μ
c. n = μ / m
d. none of the above

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Q5. The volume occupied by one number of unit mol of gas is called as

a. molecular volume
b. mol volume
c. molar volume
d. none of the above

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