Dr. Herrick's CH221
Pressure Quiz 4

     

 
                               

Classes of Chemical Reactions
Copyright D. Herrick
 

20 Questions from past exams.
(try first without a solubility table)
Practice for speed.  Aim for 2 minutes per problem.

 

                  

  

1. Which solution has the largest number of ions per mL?
A)  0.25M  Na2SO4 D) 0.20M  Ba(CH3COO)2
B)  0.18M  AlCl3 E) 0.38M  KCl
C)  0.22M  K2Cr2O7 F) 0.15M  Fe2(SO4)3

                                

2. The formula for the hydronium ion is
A) H2O  B) H3O   C) OH -  D) H2O+  E) H3O+ 

    

3. Which compound is most soluble in water?
A) AgI D) CuCl
B) CuBr E) PbCl2  
C) BaCl2 F) AgCl

                                

4. Which compound is least soluble in water?
A) CuBr2 B) Na2CO3 C) SrSO4 D) Zn(NO3)2

                               

5. Which compound is most soluble in water?
A) MgS B) CuS C) Al2S3 D) Ag2S 

   

 

6. Which aqueous mixture does NOT produce a precipitate?
A) AgNO3 and K2CO3
B) CH3COONa and CaCl2 
C) K2SO4 and Pb(NO3)2

                                

7. Give the products of the reaction  HCl + KOH  ?
A) potassium chloride and hypochlorous acid
B) potassium hypochlorite and hydrogen
C) water and potassium chloride

                                

8. The  mixture of aqueous calcium hydroxide and aqueous magnesium sulfate yields:
A) calcium sulfate precipitate only
B) magnesium hydroxide precipitate only
C) calcium sulfate precipitate and magnesium hydroxide precipitate
D) no reaction
E) pure calcium metal
F) pure magnesium metal

          

9. The oxidation number of oxygen in OF2 is
A) 2 B)  1  C)  0  D)  -1  E)  -2 

                                 

10. The oxidation number of vanadium in HV6O173- is
A) 2 B) 3  C)  4 D)  5  E)  6
 
11. The oxidation number of iodine in H5IO6 is
A) 7 B) 5  C) 6 D) 4  E) 3 

                             

12. The oxidation number of lead in Pb(OH)3-  is
A)  +1 B) +2 C)  +3 D) +4  E) -1

    

13. The oxidation number of N is highest in
A) NH4+ D) N2O
B) NO2 E) HNO2  
C) HNO3 F) N2H4

    

14. The oxidation number of sulfur is highest in
A) H2S D) Na2S2O8
B) S8 E) H2SO4
C) K2SO3 F) SO2

                                 

15.  The oxidation number of chromium in K2Cr2O7 is
A)  4 B) 6  C) 3 D) 8  E) 5 

                                 

16. Which is NOT an oxidation-reduction reaction 
A) 2CCl4 + K2CrO4    2Cl2CO + CrO2Cl2 + KCl
B) 2CO + O2    2CO2
C) ClO- + NO2-    NO3- + Cl-

                               

17. Identify the reducing agent in the (unbalanced) equation

Cu + H2SO4  Cu2+ + SO2 + HSO4- + H3O+
A)  Cu B)  H2SO4   C)  H2O  D) OH -   E) H3O+

     

18. Identify the oxidizing agent in the (unbalanced) reaction

 PbO2 + Cl-    ClO- + Pb(OH)3-
A)  PbO2  B)  Cl -   C)  H2O D)  OH -  E)  H+

                               

19. 31.68mL of 0.1200M NaOH titrates 40.00 mL of an unknown acid HA to the equivalence point.  The molarity of the acid is:
A) 6.600 D) 0.2903
B) 0.09504 E) 0.07661
C) 0.1542 F) 0.04752

                                  

20. Balance the equation  (note: balancing redox rxns will NOT be covered this term)

CO(g) + I2O5(s)      I2(s) + CO2(g)

and determine the grams of carbon dioxide produced per gram of iodine produced.
(atomic weights:  C=12,  O = 16,  I = 127)
A)  0.87 B)  0.17 C)  0.43 D)  1.2 E)  1.7 

 

 

 

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   Copyright D. Herrick