Acids               Quiz #3                       Leveling effect, Anhydrides, Hydrolysis, Relationships  Answers

 

1.         Which of the following oxides will form the most acidic solution?

            A.        SO2

            B.        MgO

            C.        Na2O

            D.        Al2O3

 

2.         Which one of the following salts will produce an acidic solution?

            A.        KBr

            B.        LiCN

            C.        NH4Cl

            D.        NaCH3COO

 

3.         The balanced equation for the reaction between sodium oxide and water is

            A.        Na2O + H2O → 2NaOH

            B.        Na2O + H2O → 2NaH  +  O2

            C.        Na2O + H2O → 2Na +  H2O2

                    D.        Na2O + H2O → 2Na + H2 +O2       

 

4.         Normal rainwater is slightly acidic due to the presence of dissolved

            A.        methane

            B.        carbon dioxide

            C.        sulphur dioxide

            D.        nitrogen dioxide

 

5.         Which of the following oxides would hydrolyze to produce hydroxide ions?

            A.        NO

            B.        SO2

            C.        Cl2O

            D.        Na2O

 

6.         The approximate pH of “normal” rainwater is

            A.        0

            B.        6

            C.        7

            D.        8

 

 

7.         Which of the following oxides would hydrolyze to produce hydronium ions?

A.        CaO

            B.        SO2

            C.        MgO

            D.        Na2O

 

8.         Which of the following gasses results in the formation of acid rain?

            A.        H2

            B.        O3

            C.        SO2

            D.        NH3

 

9.         Consider the following acid base solution

                        HSO3- + HF ⇄ H2SO3 + F-    

            The order of Bronsted-Lowry acids and bases in this equation is

            A.        acid + base ⇄ acid + base

            B.        acid + base ⇄ base + acid

            C.        base + acid ⇄ base + acid

            D.        base + acid ⇄ acid + base

 

10.       The conjugate acid of OH- is

            A.        H+

            B.        O2-

            C.        H2O

            D.        H3O+

 

11.       Which of the following 0.10 M solutions will have the greatest electrical

            conductivity?

            A.        HF

            B.        NH3

            C.        NaOH

            D.        C6H5COOH

 

 

12.       The amphiprotic ion HSeO3- can undergo hydrolysis according to the following equations

HSeO3- + H2O ⇄ H2SeO3 + OH-

Kb

HSeO3- + H2O ⇄ SeO32-+ H3O+

Ka

 

An aqueous solution of HSeO3- is found to be acidic. This observation indicates that when it is added to water, HSeO3- behaves mainly as a

 

            A.        proton donor, and Kb is less than Ka

            B.        proton donor, and Kb is greater than Ka

                    C.        proton acceptor, and Kb is less than Ka

            D.        proton acceptor, and Kb is greater than Ka

 

 

 

 

 

13.       The Kb expression for HPO42- is

            A. [PO43-][H3O+]                     B. [HPO42-][ OH - ]

                     [HPO42-]                                 [H2PO4-]

            C. [H2PO4-][ OH - ]               D. [HPO42-][ H3O+]

        [HPO42-]                                     [PO43-]

 

14.       Given the equilibrium:            H2BO3-  +   H2PO4-  ⇌   H3BO3  +  HPO42-

            Which is the strongest acid?

            A.        HPO42-

            B.        H3BO3

            C.        H2PO4-

            D.        H2BO3-

 

 

15.       Which species is not amphiprotic?

            A.        H2O

            B.        H3BO3

            C.        H2PO4-

            D.        H2C6H5O7-

 

16.       What is produced when CH3NH2 acts as a base in water?

            A.        CH3NH-

            B.        CH3NH3+

            C.        CH3NH2+

            D.        CH2NH2-

           

17.       What species will form when H+ ions are in the presence of H2O molecules?

            A.        HO+

            B.        H2O+

            C.        H3O+

            D.        H2O2+

 

18.       What is the conjugate acid of the base HAsO42-?

            A.        AsO43-

            B.        H2AsO4-

            C.        H4AsO4+

            D.        H3AsO4

 

19.       Which solution will have the greatest electrical conductivity?

            A.        0.50 M HCl

            B.        0.10 M RbOH

            C.        0.50 M K3PO4

            D.        2.0 M C6H12O6

 

 

20.       The following equilibrium favours the formation of products:

            NH2OH   +   CH3NH2      ⇌     CH3NH-   +   NH3OH+

            Which species is the strongest acid?

            A.        NH3OH+

            B.        NH2OH

            C.        CH3NH2

            D.        CH3NH-

 

21.       Which of the following solutions would have the greatest [OH-]?

            A.        0.1 M HCO3-

            B.        0.1 M HPO42-

            C.        0.1 M H2PO4-

            D.        0.1 M CO32-

 

22.       Which of the following amphiprotic ions will act predominantly as a base in

            solution?

            A.        HSO3-

            B.        HSO4-

            C.        H2PO4-

            D.        HPO42-

 

23.       Which is the strongest base?

            A.        Cl-

            B.        NO2-

            C.        HPO42-

            D.        CH3COO-

 

24.       Water has the greatest tendency to act as an acid with which of the following?

            A.        Cl-

            B.        NO2-

            C.        HPO42-

            D.        CH3COO-

 

25.       Water has the greatest tendency to act as a base with which of the following?

            A.        HF

            B.        H2CO3

            C.        H3PO4

            D.        CH3COOH

 

26.       Which of the following will have the smallest Ka value?

            A.        HF

            B.        H2CO3

            C.        H3PO4

            D.        CH3COOH

 

 

27.       Which of the following will have the smallest Kb value?

            A.        IO3-

            B.        NH3

            C.        CN-

            D.        HPO42-

 

28.       What volume of 0.500 M NaOH is required to neutralize 25.0 mL 0.250 M HBr ?

            A.        5.00 mL

            B.        12.5 mL

            C.        20.0 mL

            D.        25.0 mL

 

29.       Which of the following Ka values represents the acid that is strongest?

            A.        Ka  =  2.8  x  10-18

            B.        Ka  =  8.2  x  10-18

            C.        Ka  =  4.4  x  10-22

            D.        Ka  =  6.4  x  10-22

 

 

30.       Which of the following Ka values represents the acid with the strongest conjugate

            base?

            A.        Ka  =  2.8  x  10-18

            B.        Ka  =  8.2  x  10-18

            C.        Ka  =  4.4  x  10-22

            D.        Ka  =  6.4  x  10-22