Question

Give examples of eight metals that show variable valency.

Answer 1

Eight metals which show variable valency are

(i) Copper	\[\ce{Cu^{1+}  Cu^{2+}[Cupric]}\]
(ii) Silver	\[\ce{Ag^{1+}  Ag^{2+}[Argentic]}\]
(iii) Mercury	\[\ce{Hg^{1+}[mercurous]  Hg^{2+}[mercuric]}\]
(iv) Iron	\[\ce{Fe^{2+}[Ferrous]  Fe^{3+}[Ferric]}\]
(v) Lead	\[\ce{Pb^{2+}[Plumbous]  Pb^{4+}[Plumbic]}\]
(vi) Tin	\[\ce{Sn^{2+}[stannous]  Sn^{4+}[Stannic]}\]
(vii) Gold	\[\ce{Au^{1+}[Auruous]  Au^{3+}[Auric]}\]
(viii) Manganese	\[\ce{Mn^{2+}[Mangnous]  Mn^{4+}[Manganic]}\]