Question

1.

5SiO32- + 2Br2+ 3H2O ------------> 5Si + 4BrO3-+ 6OH-

In the above reaction, the oxidation state of bromine changes from ___(-7-6-5-4-3-2-10+1+2+3+4+5+6+7) to ___(-7-6-5-4-3-2-10+1+2+3+4+5+6+7).

How many electrons are transferred in the reaction?

2.

2Sn2+ + 2SbO++ 3H2O --------------> Sb2O5 + 2Sn+ 6H+

In the above reaction, the oxidation state of tin changes from ___(-7-6-5-4-3-2-10+1+2+3+4+5+6+7) to ___(-7-6-5-4-3-2-10+1+2+3+4+5+6+7.)

How many electrons are transferred in the reaction?

Answer 1

Oxidation state of br in Br2 is zero.

And oxidation state of Br in Bro3 is (+6).