a) A, B and C are 3 elements which undergo chemical reaction according to following equations a)A_2O_3 +2B to B_2O_3 + 2A b)3CSO_4 + 2B to B_2(SO_4)_3 + 3C c)3CO + 2Ato A_2 SO_3 + 3C Answer the following: i) Which element is most reactive? ii) Which element is least reactive? b) Why is ZnO called amphoteric oxide? Name another amphoteric oxide.

a) A, B and C are 3 elements which undergo chemical reaction according

1.	a) A, B and C are 3 elements which undergo chemical reaction according to following equations a)A_2O_3 +2B to B_2O_3 + 2A b)3CSO_4 + 2B to B_2(SO_4)_3 + 3C c)3CO + 2Ato A_2 SO_3 + 3C Answer the following: i) Which element is most reactive? ii) Which element is least reactive? b) Why is ZnO called amphoteric oxide? Name another amphoteric oxide.
Answer» SOLUTION :a) i) Most reactive element is B as it has replaced both A and C from their compounds. ii) Element C is least reactive as it has been replaced both by A and B b) Zinc oxide (ZnO) is called amphoteric oxide as it behaves both as ACIDIC oxide and basic oxide. `underest("basic oxide")(ZnO) + underset("acid")(2HCl) to underset("zinc chloride")(ZnCl_2) + H_2O` `underset("acidic oxide")(ZnO)+ underset("base")(2NaOH) to underset("sodium zincate")(Na_2ZnO_2) + H_2O` Alluminium oxide `(Al_2O_3)`is another amphoteric oxide.