Question

Poling process
 This question as multiple correct options
A) Reduces $SnO_2 to Sn
B) oxidizes impurity like Iron and removes as scum
C) uses green poles
D) uses brown poles

Answer 1

Hint: In the given question we will understand the process of poling. As this process is done for the purpose of refining of metals. Thus, in this process of polling some reaction will also take place. As to remove the impurities some chemicals should be added.

Complete answer:
Poling process is also known as metallurgical method hired for the purification of metals such as copper which comprehends copper oxide as an impurity occur in between the process and likewise in the purification of tin which contains tin oxide or we can say stannic oxide or\[\;Sn{O_2}\] as an impurity.

We can define Poling as a process which is done for the refining process of crude metal for removing metal oxide impurities by stirring molten metal in a ladle with help of a pole of green wood (poles). So, in the poling process, the reduction of oxides to metal atoms will take place.

Hence the options A, B and C are correct answers.

Note:There must be some care should be taken to avoid removing too much of the oxygen as of from the anode side of copper, in place this will cause some other impurities which will change from their oxide to metallic states and they will endure in solid solution in the copper, and decrease its conductivity and change in its physical assets.