MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following may be the most appropriate unit of expressing lead concentrations in drinking water? |
| A. | mg |
| B. | mmole |
| C. | ppm |
| D. | ppb |
| Answer» E. | |
| 2. |
What is the concentration, in ppm, if 0.025 g of KCl is dissolved in 100 grams of water? |
| A. | 4 x 10<sup>3</sup> ppm |
| B. | 250 ppm |
| C. | 2.5 x 10<sup>-4</sup> ppm |
| D. | 2.5 ppm |
| Answer» C. 2.5 x 10<sup>-4</sup> ppm | |
| 3. |
What does the unit mmole/kg represent? |
| A. | Molarity |
| B. | Molality |
| C. | Molar mass |
| D. | Milli-molarity |
| Answer» C. Molar mass | |
| 4. |
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? |
| A. | 63.7 |
| B. | 11.9 |
| C. | 6.5 |
| D. | 11.6 |
| Answer» C. 6.5 | |
| 5. |
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? |
| A. | 2.333 M |
| B. | 6.000 M |
| C. | 3.333 M |
| D. | 1.500 M |
| Answer» B. 6.000 M | |
| 6. |
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» C. Unsaturated | |
| 7. |
What is the molarity of 20% (w/v) H2SO4 solution? |
| A. | 0.51 M |
| B. | 1.02 M |
| C. | 4.08 M |
| D. | 2.04 M |
| Answer» E. | |
| 8. |
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» C. 0.0005 m | |
| 9. |
What symbol is used to denote molality ? |
| A. | M |
| B. | m |
| C. | mM |
| D. | n |
| Answer» C. mM | |
| 10. |
Which of the following concentration determine techniques gives a more accurate value? |
| A. | Molarity |
| B. | Molality |
| C. | Formality |
| D. | Normality |
| Answer» C. Formality | |
| 11. |
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. |
| A. | 0.0196 |
| B. | 0.5000 |
| C. | 0.3333 |
| D. | 0.9259 |
| Answer» B. 0.5000 | |
| 12. |
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). |
| A. | 12.128 mL |
| B. | 20.613 mL |
| C. | 10.307 mL |
| D. | 24.256 mL |
| Answer» D. 24.256 mL | |
| 13. |
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» C. 0.111 M | |
| 14. |
What is the molality of a dilute aqueous 0.02 N H3PO4 solution? |
| A. | 0.0050 |
| B. | 0.0200 |
| C. | 0.00330 |
| D. | 0.0067 |
| Answer» E. | |
| 15. |
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) |
| A. | 9 |
| B. | 24 |
| C. | 40 |
| D. | 87 |
| Answer» D. 87 | |
| 16. |
Iron (III) oxide chunks contain 80 ppm silica (SiO2). What is the concentration of this impurity in mass%? |
| A. | 0.008% |
| B. | 0.080% |
| C. | 0.800% |
| D. | 8.000% |
| Answer» B. 0.080% | |
| 17. |
If a urea (NH2CONH2) contains 45% (by mass) N2, what is the actual urea content in the sample? |
| A. | 103.7 kg |
| B. | 96.4 kg |
| C. | 9.65 kg |
| D. | 10.4 kg |
| Answer» C. 9.65 kg | |
| 18. |
What is the mole fraction of glycerin C3H5(OH)3 in a solution containing 33g of glycerin, 60g isopropyl alcohol and rest water? |
| A. | 0.359 |
| B. | 0.258 |
| C. | 0.205 |
| D. | 0.480 |
| Answer» D. 0.480 | |
| 19. |
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» C. 0.243 N | |