`{:(,"List-II",,"List-II",),(,"Aqueous solution of salt",,"Observation with given reagent",),((P),CuSO_(4),(1),"White ppt with" KNO_(2),),((Q),"NaBr",(2),"Brown ppt with" K_(4)[Fe(CN)_(6)],),((R),AgNO_(3),(3),"Yellow turbidity with dil. HCl",),((S),CaS_(2)O_(3),(4),"Brown fumes with conc". H_(2)SO_(4)",):}`

Options

A. `{:(P,Q,R,S),(4,3,1,2):}`
B. `{:(P,Q,R,S),(1,4,3,2):}`
C. `{:(P,Q,R,S),(2,4,1,3):}`
D. `{:(P,Q,R,S),(2,4,3,1):}`

Answer

C

Explanation

`2CuSO_(4)+K_(4)[Fe(CN)_(6)]rarrunderset((Brown ppt))(Cu_(2)[Fe(CN)_(6))]+2K_(2)SO_(4)`
`2NaBr+3H_(2)SO_(4)rarr2NaHSO_(4)+underset ((Brown))(Br_(2))+SO_(2)+2H_(2)O`
`AgNO_(3)+KNO_(2)rarr underset(("White ppt."))(AgNO_(2))+KNO_(3)`
`CaS_(2)O_(3)+2HClrarrCaCl_(2)+SO_(2)+S+H_(2)O`