aq.NaOH: Dirty green ppt, insoluble in excess, turned reddish brown on standing in air.

aq.\(NH_3\) : Dirty green ppt, soluble in excess, dirty green solution.

aq.NaOH: Reddish-brown ppt, insoluble in excess.

Salt solution: Dark yellow.
Aq.\(NH_3\) : Reddish brown ppt, soluble in excess, reddish-brown solution.

Salt solution: Pale blue.
Aq.NaOH: blue ppt, insoluble in excess.

Salt solution: Pale blue.
Aq.\(NH_3\) : Blue ppt, soluble in excess, dark blue solution.

aq.NaOH: White ppt, insoluble in excess.

aq.\(NH_3\) : No visible reaction.

aq.NaOH: White ppt, soluble in excess, colourless solution.

aq.\(NH_3\) : White ppt, soluble in excess, colourless solution.

aq.\(NH_3\) : White ppt, insoluble in excess.

aq.NaOH: No visible reaction.
When warmed, colourless and pungent gas turns red litmus paper blue.

\(Al^{3+} \), \(Pb^{2+} \) may be present.
KI: No visible reaction.

\(Pb^{2+} \), \(Al^{3+} \) may be present.
KI: Yellow ppt, insoluble in excess, some ppt dissolves when warmed, golden-yellow crystals form when cooled under running water.

Dilute acid: Effervescence, gas evolved forms white ppt in limewater.

Aqueous \(Ba(NO_3)_2\): White ppt.
Dilute \(HNO_3\) : White ppt, insoluble in diulte \(HNO_3\).

Aq. \(AgNO_3\) : White ppt.
Dilute \(HNO_3\): White ppt, insoluble in dilute \(HNO_3\).
Aq. \(NH_3\) : Soluble in aq. \(NH_3\) , colourless solution

aq. \(Pb(NO_3) _2\) : Yellow ppt. Dilute \(HNO_3\): Yellow ppt insoluble in dilute \(HNO_3\).
Heat mixture till solid dissolves. Cool under tap: Yellow ppt dissolves, golden-yellow crystals form.

aq. NaOH: Colourless solution.
Devarda's alloy or Zn / Al powder. Heat gently: Vigorous effervescence observed.
Colourless and pungent gas evolved turns red litmus paper blue.

aq.\(BaCl_2\): White ppt.
Dilute HCl: ppt insoluble in acid.

aq.\(AgNO_3\): Yellow ppt.
Aq.\(HNO_3\): ppt insoluble in acid.
Aq.\(NH_3\): ppt insoluble in aq. \(NH_3\)

aq. \(Pb(NO_3) _2\) : White ppt.
Dilute \(HNO_3\): Ppt insoluble in dilute acid.
Heat mixture till solid dissolves, cool under tap: Ppt dissolves when heated to form colourless solution, reappears as shiny white crystals upon cooling.