Select the row which shows the correct charges on the ions formed by the metals in groups 1 and 2 and the non-metals in groups 6 and 7:
Group 1
Group 2
Group 6
Group 7
A
1+
2+
6+
7+
B
1-
2-
2+
1+
C
1+
2+
2-
1-
D
7-
6-
2-
1-
2. Select the row showing the correct formulae for the compound ions:
hydroxide
carbonate
sulfate
nitrate
A
OH-
CO32-
SO42-
NO3-
B
OH-
CO32-
SO42-
NO32-
C
OH2-
CO3-
SO4-
NO3-
D
OH2-
CO3-
SO32-
NO3-
Q3-5: Which is the correct formula for each of the following compounds?
3. Calcium chloride
A. CaCl
B. CaCl2
C. Ca2Cl
D. Ca7Cl2
4. Sodium carbonate
A. Na3CO
B. NaCO3
C. Na(CO3)2
D. Na2CO3
5. Lead(II)hydroxide
A. PbOH
B. Pb2OH
C. Pb(OH)2
D. PbOH2
6. In neutralization reactions the ions produced by acids join with the ion produced by alkalis. Which of these answers correctly identifies there ions?
ion from acids
ion from alkalis
A
OH-
H+
B
OH2-
H2+
C
H+
OH-
D
H+
OH2-
7. Marble chips react with dilute hydrochloric acid as follows: