Write formulas for the compounds that form from In and each of the following polyatomic ion: NO−3, SO2−4, PO3−4.

Question

(Assume In charge is 3+.)

InNo9, InSO6, AND InP4 is wrong

Answer 1

NO-3 ? , SO2-4 ?, PO3 -4

Where did you get these strange charges for the ions?
eg PO3 normally -3

ASSUMING your strange valences:
In +3
NO -3
then to be neutral
InNO

In+3 * 4 = +12
SO2-4 * 3 = -12
so
In4(SO2)3

similarly
In4 (PO3)4

But I suspect you have the original statement messed up

Answer 2

I'm sure you mean [NO3]^-, [SO4]^2- etc.
Then In(NO3)3, In2(SO4)3, etc.
If we could write subscripts very well on this forum the nitrate would be [NO₃]^-

Answer 3

there copied straight from the question page, this is making sense