Which of the following is not soluble in water?
a. potassium sulfide
b. iron (ii) bromide
c. iron (iii) hydroxide
d. iron (iii) nitrate
e. ammonium sulfate

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)

A) the enthralling of formation for pure element in its standard state is always positivehope this : )