Gen. Chem.- Chap. 4
Choose the correct answer for each question.
 

1Which of the following precipitates would form from a mixture of CuSO4 and Na2CO3 solutions?
CuCO3
Na2SO4
CuNa
none of the above

2All of the following salts are insoluble in H2O except...
CuS
Zn(OH)2
CaCl2
PbCl2

3Which of the following is a weak acid?
HBr
CH3COOH
HNO3
H2SO4

4What is the net ionic equation for the reaction of the weak acid HNO2 with RbOH?
H+ + OH- ----> H2O
Rb+ + NO2- ----> RbNO2
H+ + RbOH ----> Rb + H2O
HNO2 + OH- ----> NO2- + H2O

5The oxidation number of Mn in KMnO4 is...
+7
+1
+3
-2

6The oxidation no. of Mn in the following changes from ___ to ___.
Zn(s) + 2 MnO2(s) ----> ZnO(s) + Mn2O3(s)
+4 to +3
+7 to 0
+4 to +7
-4 to -3

7In the above eqation, the species reduced is...
Zn
MnO2
ZnO
Mn2O3

8When the following equation is balanced in an acidic solution, the no. of electrons that must be transferred is...
Cr2O72- + I- ----> Cr3+ + I2 (acid environment)
2
3
6
12

9The molarity of a solution prepared by dissolving 2.25 g H2O2 in enough water to make 750. mL of solution is...
0.0662 M
0.882 M
3.00 M
4.45 M

10Given the following chemical equation for the neutralization of boric acid (H3BO3) ...
H3BO3 + 3 OH- ----> 3 H2O + BO33-
What volume of 0.200 M Sr(OH)2 can be neutralized by 6.69 g of boric acid?
1.62 L
450 ml
270 mL
811 mL