Formula of the coloured product in the test for sulphur or phosphorus

1. A.
   $NaFe\left\lbrack Fe(CN)_{6} \right\rbrack$
2. B.
   $Na\left\lbrack Cr\left( {NH}_{3} \right)_{2}(NCS)_{4} \right\rbrack$
3. C.
   ${Na}_{2}\left\lbrack Fe(CN)_{5}(NO) \right\rbrack$
4. D.
   ${Na}_{4}\left\lbrack Fe(CN)_{5}(NOS) \right\rbrack$

Tap an option to check your answer.

1. A.
   ${Na}_{3}{PO}_{4} \cdot 12{MoO}_{3}$
2. B.
   $\left( {NH}_{4} \right)_{3}{PO}_{4} \cdot 12\left( {NH}_{4} \right)_{2}{MoO}_{4}$
3. C.
   $\left( {NH}_{4} \right)_{3}{PO}_{4} \cdot 12{MoO}_{3}$
4. D.
   ${MoPO}_{4} \cdot 21{NH}_{4}{NO}_{3}$

Tap an option to check your answer.