question_answer

\[Sn{{O}_{2}}\] is taken in basic medium and current is passed. Colloidal sol migrates towards

A) anode (\[+\] plate)

B)        cathode (\[-\] plate)

C) both [a] and [b]

D)        none of these

Correct Answer: A

Solution :

[a] In alkaline medium \[Sn{{O}_{2}}\] is converted into negatively charged colloidal sol \[Sn{{O}_{2}}+2O{{H}^{-}}\xrightarrow{{}}SnO_{3}^{2-}+{{H}_{2}}O\] Thus, [a]