Which of the following oxides is amphoteric in character?
A.
$$Sn{O_2}$$
B.
$$Si{O_2}$$
C.
$$C{O_2}$$
D.
$$CaO$$
Answer :
$$Sn{O_2}$$
Solution :
$$CaO$$ is basic as it form strong base $$Ca{\left( {OH} \right)_2}$$ on reation with water.
$$CaO + {H_2}O \to Ca{\left( {OH} \right)_2}$$
$$C{O_2}$$ is acidic as it dissolve in water forming unstable carbonic acid.
$${H_2}O + C{O_2} \to {H_2}C{O_3}$$
Silica $$\left( {Si{O_2}} \right)$$ is insoluble in water and acts as a very weak acid.
$$Sn{O_2}$$ is amphoteric as it reacts with both acid and base.
$$Sn{O_2} + 2{H_2}S{O_4} \to Sn{\left( {S{O_4}} \right)_2} + 2{H_2}O$$
$$Sn{O_2} + 2KOH \to {K_2}Sn{O_3} + {H_2}O$$
Releted MCQ Question on Inorganic Chemistry >> Classification of Elements and Periodicity in Properties
Releted Question 1
The correct order of second ionisation potential of carbon, nitrogen, oxygen and fluorine is