`{:(FeCI_(3)"solution" +(NH_(4))_(2)S overset("Neutral medium")rarr,"Black ppt".(A)),(," &quo

`{:(FeCI_(3)"solution" +(NH_(4))_(2)S overset("Neutral medium")rarr,"Black ppt".(A)),(," "darrdil.H_(2)SO_(4)),(,"White ppt". (B) +Gas (C)):}` while `AICI_(3)` solution `+(NH_(4))_(2)S rarr` White ppt.(D)
What is the formula of black ppt.(A)?
A. `Fe_(2)S_(3)`
B. `FeS`
C. `2FeS +S`
D. `FeS + Fe(OH)_(3)`

`{:(FeCI_(3)"solution" +(NH_(4))_(2)S overset("Neutral medium")rarr,"Black ppt".(A)),(," "darrdil.H_(2)SO_(4)),(,"White ppt". (B) +Gas (C)):}` while `

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