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Class 12 Chemistry Practice Test: Expressing Concentration of Solutions
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Class 12 Chemistry Practice Test: Expressing Concentration of Solutions
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20 Questions

1. 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/cm3?
2. Calculate the mole fraction of A if 25g of it is dissolved in 50 moles of B. Given the molar mass of A is 25 g/mole.
3. In a saturated solution with endothermic dissolution, how does the concentration of dissolved solute change with increasing then decreasing temperature?
4. 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.
5. Which of the following concentration determine techniques gives a more accurate value?
6. If a urea (NH2CONH2) contains 45% (by mass) N2, what is the actual urea content in the sample?
7. What is the molality of a dilute aqueous 0.02 N H3PO4 solution?
8. Calculate the volume (mL) of concentrated acid required to prepare 500 mL of 0.25 N HCl solution from concentrated stock HCl solution (specific gravity = 1.19) and 37.2% (by mass).
9. What is the molarity of 20% (w/v) H2SO4 solution?
10. 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 concentration of the resultant mixture?
11. What symbol is used to denote ‘molality’?
12. What is a solution called when the concentration of the solute equals its solubility in the solvent?
13. Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the concentration of this impurity in mass%?
14. What is the concentration, in ppm, if 0.025 g of KCl is dissolved in 100 grams of water?
15. Which of the following may be the most appropriate unit of expressing lead concentrations in drinking water?
16. What does the unit ‘mmole/kg’ represent?
17. What is the mole fraction of glycerin C3H5(OH)3 in a solution containing 33g of glycerin, 60g isopropyl alcohol and rest water?
18. Consider 100 ml of 0.3 molar solution formed by dissolving 3.33g of XCl2 in water. What is the molar mass of element X? (Atomic mass of Cl = 35.5)
19. What is the molarity of a 15 ml, 2 M aqueous solution when 285 ml of water is added to it?
20. What is the molality of a solution formed when 58.5g of NaCl is dissolved in 2000 mL of water?

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