Which of the following compounds is insoluble?

Question

Question 4 options:

A)

Ca(NO3)2

B)

FePO4

C)

NH4OH

D)

Na2SO4

E)

NaCl

Answer 1

Here is a simplified list of solubility rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
A)
Ca(NO3)2

B)
FePO4

C)
NH4OH

D)
Na2SO4

E)

NaCl

Answer 2

NH4OH