11. A given hydrocarbon is burned in the presence of oxygen gas and is converted

Question

11. A given hydrocarbon is burned in the presence of oxygen gas and is converted completely to carbon dioxide and water. Equal numbers of moles of CO2 and H2O are produced. The

hydrocarbon could be a. C3H4.

b. C5H10. c. C2H3. d. CH3. e. C3H5.

12. A sample containing only carbon, hydrogen, and silicon is subjected to elemental
analysis. After complete combustion, a 0.7020-g sample of the compound yields 1.4 g of CO2, 0.86 g of H2O, and 0.478 g of SiO2. What is the empirical formula of the compound?

a. CH3Si
b. C2H4Si c. C4H12Si d. C6H12Si2 e. CH2Si

13. When a solution of lithium chloride and a solution of ammonium sulfate are mixed, a. a new salt is formed.
b. no reaction occurs.
c. a precipitate forms.

d. an acid and a base are formed. e. a gas is evolved.

14. What products result from mixing aqueous solutions of Cr(NO3)2(aq) and NaNO3(aq)? a. Cr(OH)2(s), Na+(aq), and NO3(aq)
b. Cr(OH)2(s) and NaNO3(s)
c. Cr2(OH)2(aq) and NaNO3(aq)

d. Cr(OH)2(aq) and NaNO3(s)
e. Cr(OH)2(s), N2(g), and H2O(l)

15. Which of the following is best described as an oxidation–reduction reaction? a. SO2(g) + H2O(l) H2SO3(aq)

b. 2Cl(g) Cl2(g)
c. 3O2(g) 2O3(g)
d. 2NO2(g) N2O4(g)
e. SO2(g) + O2(g) SO3(g)

16. In which one of the following is the oxidation number of nitrogen given incorrectly? a. N2H4 (–2)

b.NaN3 (–1)
c. HNO2 (+3) d.N2O3 (+3)
e. H2N2O2 (+1)

17. What is the reduction half-reaction for the reaction between iron(II) sulfate and potassium permanganate in a sulfuric acid solution?

5Fe2+(aq) + MnO4–(aq) + 8H+(aq) 5Fe3+(aq) + Mn2+(aq) + 4H2O(l) a. MnO4–(aq) + 3e– Mn2+(aq) + 4H2O(l)
b. MnO4–(aq) + 8H+(aq) + 5e– Mn2+(aq) + 4H2O(l)
c. 5Fe2+(aq) 5Fe3+(aq) + 5e–

d. Fe2+(aq) + 2e– Fe(s)
e. MnO4–(aq) + 5e– Mn2+(aq) + SO42–(aq)

18. For the reaction that occurs in a lead storage battery,
Pb(s) + PbO2(s) + 2H+(aq) + 2HSO4–(aq) 2PbSO4(s) + 2H2O(l)

the oxidizing agent is

a. HSO4–.

b. PbSO4. c. Pb.

d. PbO2. e. H+.

19. In the following reaction,

2H2O2(l) 2H2O(l) + O2(g) hydrogen peroxide functions as

a. an acid.
b. a reducing agent.
c. an oxidizing agent.
d. both an oxidizing agent and a reducing agent. e. neither an oxidizing agent nor a reducing agent.

20. The following reaction occurs in basic solution:

_ H2O(aq) + _ MnO4–(aq) + _ ClO–(aq) _ MnO2(s) + _ ClO4–(aq) + _ OH–(aq) When the equation is properly balanced, what is the sum of the lowest whole-number coefficients?

a. 20 b. 9 c. 10 d. 6 e. 12

Explanation / Answer

Question 11

Balanced equation:
C3H4 + 4 O2 = 3 CO2 + 2 H2O

2 C5H10 + 15 O2 = 10 CO2 + 10 H2O

4 C2H3 + 11 O2 = 8 CO2 + 6 H2O

4 CH3 + 7 O2 = 4 CO2 + 6 H2O

4 C3H5 + 17 O2 = 12 CO2 + 10 H2O

Hence Option B is the answer

Question 12

C4H12Si + 8 O2 = 4 CO2 + 6 H2O + SiO2

0.702 gm C4H12Si = 0.702 / 88.22 = 0.007957 Moles

0.0318 Moles of CO2 = 0.0318 x 44 = 1.4 gm

0.0447 Mole of H2O = 0.0447 x 18 = 0.86 gm

0.0079 gm of SiO2 = 0.0079 x 60.08 = 0.478 gm

0.007957 Moles of C4H12 Si will produce 1.4 gm CO2, 0.86 gm H2O, 0.478 gm of SiO2

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