12. Which one is the general equation for a single-replacement reaction?
A. A+B → AB
B. A+BC → AC + B
C. AC + BD > AD + BC
D. AB + A + B
13. Sr reacts with HC1 in a
reaction.
A. decomposition
B. halogen replacement
C. single replacement
D. combination
14. Which of the following statement about combination reactions is not true?
A. magnesium reacts with oxygen to form magnesium oxide.
B. the reaction of nonmetals with each other forms a molecular compound
C. a combination reaction is also called a retrosynthesis
D. sodium and chlorine react to form a compound
15. Al + Ni (NO3)2 → A1 (NO3)3 is an example of a
reaction.
A. combination
B. decomposition
C. double-replacement
D. single-replacement​