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- 1. Multiple ChoiceName the given compound - Fe2(CO3)3iron (II) carbonateIron (III) carbonateIron carbonateIron carbonate (II)
- 2. Multiple ChoiceDetermine the oxidation number of each green coloured element in the following ion : S2O82-+7-2-1+6
- 3. Multiple Choice
All alkali metal react with water to produce hydrogen gas and the corresponding alkaline metal hydroxide. A typical reaction is that between lithium and water : 2Li(s) + 2H2O(l) →2LiOH(aq) + H2(g) Calculate the mass of H2 gas formed when 40.0 g of Li react with water [Ar H =1.0, Li = 6.9, O =16.0]
4.21 g7.31 g5.80 g4.42 g - 4. Multiple ChoiceUrea (NH2)2CO is prepared by reacting ammonia with carbon dioxide :
2NH3(g) + CO2(g) → (NH2)CO(aq) + H2O(l)
If 600.0 g of NH3 area allowed to react with 1142 g of CO2, determine mass of excess reactant left at the end of the reaction.456.01 g65.09 g403.21 g363.88 g - 5. Multiple ChoiceAn aqueous solution of MgSO4 is added to an aqueous solution of BaCl2 to form BaSO4 and MgCl2. If 1.75 g of MgSO4 and 2.75 g of BaCl2 are used, calculate the mass of BaSO4 produced after the reactant has completed. [Mr MgSO4 = 120.4; BaCl2 = 208.3; BaSO4 = 233.4; MgCl2 = 95.3]2.03 g1.96 g3.08 g1.50 g
- 6. Multiple ChoiceBalance the following equation in acidic medium
aMnO4-(aq) + bC2O42-(aq) →cMn2+(aq) + dCO2(g) + eH2O(l)
The sum of the coefficient a+b+c+d+d43272925 - 7. Multiple Choice0.157 g of C6H7NO was used to react with 0.486 g of C4H6O3 to produce C8H9NO2 and CH3COOH. After purification, 0.198 g of C8H9NO2 was extracted. Determine the percentage yield of C8H9NO2. [Ar C : 12.O; H=1.0; N=18; O=16.0]70.09%85.62%91.24%90.90%
- 8. Multiple ChoiceCalculate the mass (in kg) of water produced from the combustion of 1.0 gallon (3.8 L) of gasoline (C8H18). The density of gasoline is 0.79 g/mL [Mr C : 12.0; H : 1.0]3.33 kg7.12 kg4.27 kg6.57 kg
- 9. Multiple ChoiceIf 4.50 g of HCl is reacted with 15.0 g of CaCO3 according to the following chemical equation,
2HCl + CaCO3 → CaCl2 + H2O + CO2
Calculate the theoretical yield (in gram) of
CO22.05 g4.12 g3.02 g2.71 g - 10. Multiple Choice290.23 mg of ethanol (C2H5OH) is reacted with excess oxygen (O2) to provide 481.11 mg of CO2. What is the percentage yield of CO2 in this reaction?90.0 %86.7 %67.8 %77.8 %
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