CHEMICAL PROPERTIES OF CARBON FAMILY
CHEMICAL PROPERTIES OF CARBON FAMILY (1) Reactivity towards acids : C, Si, Ge unaffected by dilute acid but Sn dissolves in dilute HNO 3 forming Sn(NO 3 ) 2 . Pb dissolves slowly in dilute HCl forming PbCl 2 and quite readily in dilute HNO 3 forming Pb(NO 3 ) 2 and oxides of nitrogen. Si is oxidised and undergoes fluorination by hot concentrated HF/HNO 3 . Sn dissolves in several concentrated acids. Pb does not dissolves in concentrated HCl because a surface coating of PbCl 2 is formed. (2) Reactivity towards alkalies : Carbon is unaffected by alkalies. Si reacts slowly with cold aqueous solution of NaOH and readily with hot NaOH solution giving solution of silicates [SiO 4 ] 4– . Sn and Pb are amphoteric it dissolve...
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