[" Among the following identify the total "],[" number of cations which tends to form "],[" solution when each cation is treated with "],[" excess "NH_(4)OH(aq.).],[Pb^(2+);Cd^(2+);Hg^(2+);Bi^(3+);Cu^(2+);Ag^(+)]

Find number of basic radicals among the following cations, which can form soluble complex on adding excess of NH_(4) solution. Cd^(2+)(aq.),Pb^(2+)(aq.),Ni^(2+)(aq.),Mn^(2+)(aq.),Zn^(2+)(aq.),Ag^(+)(aq.),Hg^(2+)(aq.),Fe^(3+)(aq.),Mg^(2+)(aq.)

Which of the following is formed when As_(2)S_(3) is warmed with NH_(4)OH and H_(2)O_(2) ?

Which of the following is formed in solution when [Cu(NH_(3))_(4)]^(2+) is treated with KCN till the colour of the complex is discharged?