(a) Which group of metals are moderately reactive ? Why ?

Question

Group A : K, Na, Ca, Mg 

Group B : Zn, Fe, Pb, Cu 

Group C : Hg, Ag, Au, Pt 

(a) Which group of metals are moderately reactive ? Why ? 

(b) Which group of metals are never found in nature in free state ? Why ? 

(c) Write any two ores of any two metals of group B. 

(d) Which group of metals are used to make jewellery ? Why ?

Answer 1

(a) Metals of group 'B' are moderately reactive. 

Because, they are found in the Earth crust mainly as oxides, sulphides and carbonates. 

(b) Metals of group 'A' are never found in nature in free state. 

Because they are highly reactive. 

(c) Zn : Incite (ZnO) and Zincblende (ZnS). 

Fe : Haematite (Fe₂O₃) and Magnetite (Fe₃O₄). 

(d) Metals of group 'C' are used to make jewellary. 

Because, they donot oxidize in normal weather conditions.