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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.)`

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Verified by Experts

The correct Answer is:
4
Soluble in excess `NH_(3)` solution.
`Cd^(2+)(aq.),Ni^(2+)(aq.),Zn^(2+)(aq.),Ag^(+)(aq.)`
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