Consider the following reactions and answer the following questions.
M(Double salt)+`NH_(4)Cl(s)+NH_(4)OH to `No ppt.
M(double salt)+`NaOH` solution`toN uarr+Pdarr` (coloured ppt.)
Q. Which of the following pair of cations are present in salt M?

Options

A. `PH_(4)^(+),Mg^(2+)`
B. `NH_(4)^(+),Fe^(3+)`
C. `PH_(4)^(+),Zn^(2+)`
D. `NH_(4)^(+),Fe^(2+)`

Answer

D