Question

$ Pb{{O}_{2}}+Pb\xrightarrow{{}}2PbO\,;\,{{\Delta }_{r}}G{}^\circ <0 $ $ Sn{{O}_{2}}+Sn\xrightarrow{{}}2SnO;\,{{\Delta }_{r}}G{}^\circ >0 $ Which oxidation states are more characteristic for lead and tin?

• A. For lead +4, for tin +2
• B. for lead +2 , for tin +4
• C. For lead +2, for tin +2
• D. For lead +4, for tin +4

Answer 1

Answer: (B)

Since $ {{\Delta }_{r}}G{}^\circ $ is negative for first reaction, therefore, +2 oxidation state of Pb is more stable. Further, since $ {{\Delta }_{r}}G{}^\circ $ is positive for second reaction, therefore, +4 oxidation state of Sn is more stable. Thus option is correct.