Reactivity of Metals |
Table-4 |
| metals | action of oxygen | reaction with cold water | reaction with steam | reaction with dilute strong acids | reaction with chlorine on heating |
| k | from Na 2o,k2O in limited supply of o2 but form peroxides in excess of O2 | K to Mg displace H2 from cold water with decreasing reactiviy {k violently but Mg very slowly} | K to Fe displace H2with steam withoput decreasing reactivity.{k very violently but Fe very slowly} | K to pb displace H2 from dilute strong acids with decreasing reactivity.{ k-explosively, Mg-very vigorously,Fe-steadily,pb-very slowly} | All metals react with chlorine on heating to form their respective chlorides but with decreasing reactivity from top to bottom. this is understood from the heat evolved when the metal reacts with one mole of chlorine gas to form chloride. KCl,NaCl,CaCl2,Mgcl2l,AlCl3,ZnCl2,FeCl3pbCl2,CuCl2,HgCl2,AgCl,PtCl3and AuCl3are formed |
|---|---|---|---|---|---|
| Na | |||||
| Ca | burn with decreasing vigour to form oxides CaO,MgO,A12O3,ZnO,fe2O3 | ||||
| Mg | |||||
| Al | from Al to Au do not displace H2from cold water | ||||
| Zn | |||||
| Fe | |||||
| Pb | don't burn,but only for, a surface layer of oxide pbO,CuO,HgO | from pb to Au donot displace H2 from steam | |||
| Cu | Cu to Au do not displace H 2 from dilute strong acids | ||||
| Hg | |||||
| Ag | don't burn or oxidise even on the surface | ||||
| Pt | |||||
| Au |