Question

67.
Which elements are oxidised and reduced
respectively in the reaction :-
SnCl2 + Cro5— SnCl. + Cro4-2
(1) Sn, 0
(2) Sn, Cr
(3) Cr, o
(4) Cr, Sn​

Answer 1

Answer:

option 3 is right because Cr is. oxidised

Answer 2

In the above reaction Oxygen (O) undergoes reduction and Tin (Sn) undergoes Oxidation

• The given reaction is SnCl₂+ Cro₅— SnCl₄ + CrO₄⁻²

• In CrO₅ the oxidation state of Cr is +6 which does not changes as further the reaction proceeds and it changes to CrO₄⁻

• O has 6/5 oxidation state in CrO₅ which changes to -2 in CrO₄⁻.So it undergoes reduction

• Sn has +2 oxidation state in SnCl₂ whereas +4 oxidation state in SnCl₄.So it undergoes oxidation