MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What’s the balanced equation of CO2 + H2O → C6H12O6 + O2? |
| A. | CO2 + H2O → C6H12O6 + O2 |
| B. | 6 CO2 + 6 H2O → C6H12O6 + 6 O2 |
| C. | 6 CO2 + 6 H2O → C6H12O6 + 2 O2 |
| D. | 3 CO2 + 2H2O → C6H12O6 + O2 |
| Answer» C. 6 CO2 + 6 H2O → C6H12O6 + 2 O2 | |
| 2. |
Find the amount of carbon dioxide produced by the combustion of 20g of methane. |
| A. | 44g |
| B. | 20g |
| C. | 66g |
| D. | 22g |
| Answer» D. 22g | |
| 3. |
In a container, there are 4 moles of nitrogen, 3 moles of oxygen and 7 moles of hydrogen; find out the mole fraction of oxygen in this reaction. |
| A. | 0.2143 |
| B. | 0.2142 |
| C. | 0.1234 |
| D. | 0.2434 |
| Answer» B. 0.2142 | |
| 4. |
A solution contains 8 moles of solute and the mass of the solution is 4 kg. What’s the molality of this solution? |
| A. | 5 mol/kg |
| B. | 8 mol/kg |
| C. | 4 mol/kg |
| D. | 0.5 mol/kg |
| Answer» E. | |
| 5. |
A and B are two solutions that are mixed. Calculate the resultant solution’s molarity. |
| A. | 0.8 mol/L |
| B. | 0.88 mol/L |
| C. | 1.3 mol/L |
| D. | 1.05 mol/LView Answer |
| Answer» C. 1.3 mol/L | |
| 6. |
Calculate the mass percent of magnesium in the formation of magnesium oxide. |
| A. | 0.3 |
| B. | 1.5 |
| C. | 0.67 |
| D. | 0.6 |
| Answer» E. | |
| 7. |
What is the amount of water produced when 8g of hydrogen is reacted with 32g of oxygen? |
| A. | 2moles |
| B. | 1mole |
| C. | 3 moles |
| D. | 0.5mole |
| Answer» B. 1mole | |
| 8. |
Which of the given reactions are counted as balanced reactions? |
| A. | H2 + O2 → 2H2O |
| B. | 4Al + 3O2 → 2Al2O3 |
| C. | Mg(OH)2 + 2HNO3 → 2Mg(NO3)2 + 2H2O |
| D. | N2 + 3H2 → NH3 |
| Answer» C. Mg(OH)2 + 2HNO3 → 2Mg(NO3)2 + 2H2O | |
| 9. |
Which of the following is not true regarding balanced chemical equations? |
| A. | They contain the same number of atoms on each side |
| B. | Electrons are also balanced |
| C. | An equal number of molecules on both the side |
| D. | Follows the law of conservation of mass |
| Answer» D. Follows the law of conservation of mass | |
| 10. |
In a particular reaction, one of the reactants limits the number of products formed. That is called as _______ |
| A. | Limiting reagent |
| B. | Limiting product |
| C. | Excessive reagent |
| D. | Excessive reactant |
| Answer» B. Limiting product | |