Question

What type of reactions are these?

Answer 1

1. Cu(NO3)2+Zn(s) -------> Cu(s)+Zn(NO3)2


2. Na2S (1) + CdNO3 (1) ------> CdS (s) +2NaNO3 (1)

Answer 2

Great question.

This is an example of a single replacement reaction.

The general form is:

AB + C --> AC + B for question 1.
The second one is a double replacement reaction:
The general form is:

AB + CD --> AC + BD