MCQs on Mole Concept

Mole is the amount of any substance such as atoms, electrons, ions, molecules, etc. that contains 6.022 × 10²³ particles. According to the previous definition, the amount of substance that contains as many species as present in 12 g of C-12, is known as a mole. This definite number is called the Avogadro constant.

1. Find the mole fraction of a solute in 1 m aqueous solution.

(a) 0.0354

(b) 1.770

(c) 0.177

(d) 0.0177

2. Which of the following units of concentration is temperature dependent?

(a) Mole fraction

(b) Molarity

(c) Molality

(d) Weight percentage

3. Which of the following units of concentration is not temperature dependent?

(a) Weight volume percent

(b) Normality

(c) Molarity

(d) Molality

4. Find the amount of dibasic acid with mol. weight 200 required to produce 100 ml of 0.1 N aqueous solution.

(a) 2 g

(b) 10 g

(c) 20 g

(d) 1 g

5. What is the mole fraction of solute in 1 molal aqueous solution?

(a) 0.018

(b) 0.009

(c) 0.036

(d) 0.027

6. Which of the following will increase the vapor pressure of an aqueous solution in KI (molality = 1.00 m)?

(a) Addition of Na₂SO₄

(b) Addition of NaCl

(c) Addition of water

(d) Addition of 1.00 molal KI

7. The amount of 70% HNO₃ required to prepare 250 ml of 2.0 M HNO₃ is

(a) 54.0 g

(b) 70.0 g

(c) 90.0 g

(d) 45.0 g

8. Which of the following is not true for an ideal solution?

(a) It obeys Raoult’s law

(b) 𝚫_mixV = 0

(c) 𝚫_mixH = 0

(d) 𝚫_mixS = 0

9. Which of the following is correct for an acetone solution in ethanol?

(a) It shows a negative deviation from Raoult’s law.

(b) It obeys Raoult’s law.

(c) It behaves like a near ideal solution.

(d) It shows a positive deviation from Raoult’s law.

10. FInd the molarity of 98% H₂SO₄ solution at 35℃ with density equal to 1.84 g/cc.

(a) 18 M

(b) 18.4 M

(c) 8.14 M

(d) 4.18 M

Answer

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