Because if you have a liquid then you need a glass to keep it together and when it is a solid it is already together so you don't need to do anything
Gas is the correct answer
Answer:
colloidal system liquid dispersed in gas.
It would be MnSO4
The (II) lets you know it’s the form with a 2+ charge and Sulfate has a 2- charge
These will cancel out making it plain MnSO4
If it was manganese (iii) sulfide the answer would be Mn2(SO4)3