# General Science MCQ – 21 (Chemistry)

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1. How many moles of oxygen gas will react with 12.4 mol aluminum for the Equation: 4A1 + 3O2 -> 2A12O3?
(A) 9.3 mol
(B) 5.3 mol
(C) 9.1 mol
(D) 16.8 mol

2. Balance of the following redox equation occurring in aqueous solution: KMnO4 + KCI + H2SO4 -> MnSO4 + K2SO4 + H2O + Cl2, what is the stoichiometric coefficient for chlorine (Cl2) when the equation is balanced with smallest whole number coefficients?
(A) 5
(B) 8
(C) 6
(D) 7

3. Data :
(1) H2(g) + ½O2(g) → H2O(g) ΔH = -241.8 kJ
(2) H2(g) + ½O2(g) → H2O(l) ΔH = -285.8 kJ
On the basis of the above data, which of the following statement is false?
(A) The reverse of reaction 2 is endothermic
(B) Reaction 1 is exothermic
(C) ΔH for the reaction: H2O(l) → H2O(g) is + 44 kJ/mol.
(D) None of the above

4. What is the amount of heat necessary to raise the temperature of 8.5 kg of water from 12.5o to 84o C?
(A) 36 j
(B) 3.0 x103 kj
(C) 2.6 x103 kj
(D) 2.5 x103 kj

5. Data:
ΔH°f values: CH4(g), -74.8 kJ; CO2(g), -393.5 kJ; H2O(l), -285.8 kJ.
Using the ΔH°f data above, calculate ΔH°rxn for the reaction below.
Reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)?
(A) -890.3 KJ
(B) 890.3 KJ
(C) 997.7 KJ
(D) -997.3 KJ

6. Which of the following is not a state function?
(A) V
(B) p
(C) q
(D) ΔH

7. Two solutions (the system), each of 25.0 mL volume and at 25.0 °C, are mixed in a beaker. A reaction occurs between them, causing the temperature to drop to 20.0 °C. After the products have equilibrated with the surroundings, the temperature is again 25.0 °C and the total volume is 50.0 mL. No gases are involved in the reaction. Which one of the following relationships concerning the change from initial to final states (both at 25.0 °C) is correct?
(A) ΔE = 0
(B) ΔH = 0
(C) q = 0
(D) w = 0

8. Which one of the following processes id exothermic?
(A) H2(g) → 2H(g)
(B) H2O(g) -> H2O(1)
(C) CO2(s) → CO2(g)
(D) H2(l) → H2(g)

9. Data:
2Ba(s) + O2(g) → 2BaO(s) ΔH° = -1107.0 kJ Ba(s) + CO2(g) + ½O2(g) → BaCO3(s) ΔH° = -822.5 kJ
Given the data above,
calculate ΔH° for the reaction below.
Reaction: BaCO3(s) → BaO(s) + CO2(g)?
(A) 284 .1 kj
(B) 269.0 kj
(C) 537 kj
(D) -284.5 kj

10. Predict the signs of ΔH°, ΔS°, and ΔG° for the vaporization of liquid water at 150°C?
(A) ΔH° > 0, ΔS° > 0, ΔG° < 0
(B) ΔH° < 0, ΔS° < 0, ΔG° < 0
(C) ΔH° > 0, ΔS° < 0, ΔG° > 0
(D) ΔH° > 0, ΔS° > 0, ΔG° > 0

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