Solutions Chemistry Class 12 MCQ PDF (Expressing Concentration of Solutions) for AIIMS, NEET, JEE provides a comprehensive coverage of the fundamental concepts in the fields of Solutions Chemistry. It contains a variety of questions from previous years’ AIIMS, NEET and JEE papers.

## Solutions Chemistry Class 12 MCQ PDF (Expressing Concentration of Solutions)

**1****. Iron (III) oxide chunks contain 80 ppm silica (SiO**_{2}**). What is the concentra****tion of this impurity in mass%?**

_{2}

a) 0.008%

b) 0.080%

c) 0.800%

d) 8.000%

**Answer: **0.008%

**2****. Consider 100 ml of 0.3 molar solution formed by dissolving 3.33g of XCl**_{2}** in water. What is the molar**** mass of element X? (Atomic mass of Cl = 35.5)**

_{2}

a) 9

b) 24

c) 40

d) 87

**Answer: **40

**3****. What is the molality of a dilute aqueous 0.02 N H**_{3}**PO**_{4}** solution?**

_{3}

_{4}

a) 0.0050

b) 0.0200

c) 0.00330

d) 0.0067

**Answer: **0.0067

**4. What is the molarity of a 15 ml, 2 M aqueous solution when 285 ml of water is added to it?**

a) 0.400 M

b) 0.100 M

c) 0.111 M

d) 0.105 M

**Answer: **0.100 M

**5****. Calculate the volume (mL) of concentrated acid required to prepare 500 mL of 0.25 N HCl solution from concentrated stock HCl solution (specific gravi****ty = 1.19) and 37.2% (by mass).**

a) 12.128 mL

b) 20.613 mL

c) 10.307 mL

d) 24.256 mL

**Answer: **10.307 mL

**6****. Calculate the mole fraction of A if 25g of it is dissolved in 50 moles of B. Given th****e molar mass of A is 25 g/mole.**

a) 0.0196

b) 0.5000

c) 0.3333

d) 0.9259

**Answer: **0.0196

**7****. Which of the following concentration determine techniqu****es gives a more accurate value?**

a) Molarity

b) Molality

c) Formality

d) Normality

**Answer: **Molality

**8****. In a saturated solution with endothermic dissolution, how does the concentration of dissolved solute change with increasi****ng then decreasing temperature?**

a) Keeps increasing

b) Keeps decreasing

c) Increases and decreases

d) Decreases and increases

**Answer: **Decreases and increases

**9****. What symbo****l is used to denote ‘molality’?**

a) M

b) m

c) mM

d) n

**Answer: **m

**1****0****. What is the molality of a solution formed when 58.5g of NaCl is**** dissolved in 2000 mL of water?**

a) 29.2500 m

b) 0.5000 m

c) 0.0005 m

d) 0.2925 m

**Answer: **0.5000 m

**11****. What is the molarity of 20% (w/v) H**_{2}**SO**_{4}** solut****ion?**

_{2}

_{4}

a) 0.51 M

b) 1.02 M

c) 4.08 M

d) 2.04 M

**Answer: **2.04 M

**1****2****. What is a solution called when the concentration of the solute equals**** its solubility in the solvent?**

a) Dilute

b) Saturated

c) Unsaturated

d) Supersaturated

**Answer: **Saturated

**1****3****. If 2 L, 4 L and 6 L of three separate solutions of concentrations 1 M, 2 M and 3 M, respectively, are mixed together then what is the concentr****ation of the resultant mixture?**

a) 2.333 M

b) 6.000 M

c) 3.333 M

d) 1.500 M

**Answer: **2.333 M

**14****. What is the number of moles in 650 mL of 98% (v/v) sulfuric acid solution if density of sulfuric acid is 1.83 g/cm**^{3}**?**

^{3}

a) 63.7

b) 11.9

c) 6.5

d) 11.6

**Answer: **11.9

**1****5****. What does**** the unit ‘mmole/kg’ represent?**

a) Molarity

b) Molality

c) Molar mass

d) Milli-molarity

**Answer: **Molality

**1****6****. What is the concentration, in ppm, if 0.025 g of KCl is d****issolved in 100 grams of water?**

a) 4 x 10^{3} ppm

b) 250 ppm

c) 2.5 x 10^{-4} ppm

d) 2.5 ppm

**Answer: **250 ppm

**17****. Which of the following may be the most appropriate unit of expressing lead co****ncentrations in drinking water?**

a) mg

b) mmole

c) ppm

d) ppb

**Answer: **ppb

**1****8****. What is the normality of lead (II) nitrate if the density of its 26% (w/w) aqueous solution is 3.105 g/mL? Take molar mass of lead (II) nitrate to be 331g/mol.**

a) 2.437 N

b) 4.878 N

c) 0.243 N

d) 0.488 N

**Answer: **4.878 N

**19****. What is the mole fraction of glycerin C**_{3}**H**_{5}**(OH)**_{3}** in a solution containing 33g of glycerin, 60g is****opropyl alcohol and rest water?**

_{3}

_{5}

_{3}

a) 0.359

b) 0.258

c) 0.205

d) 0.480

**Answer: **0.205

**20****. If a urea (NH**_{2}**CONH**_{2}**) contains 45% (by mass) N**_{2}**, what is the act****ual urea content in the sample?**

_{2}

_{2}

_{2}

a) 103.7 kg

b) 96.4 kg

c) 9.65 kg

d) 10.4 kg

**Answer: **96.4 kg