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In view of the signs of DeltarG^@ for t...

In view of the signs of `Delta_rG^@` for the following reactions :
`PbO_2 +Pb rarr 2PbO,Delta_rG^@ lt 0`
`SnO_2 +Sn rarr 2SnO, Delta_rG^@ gt 0`
Which oxidation states are more characteristic for lead and tin ?

A

For lead +2 for tin +2

B

For lead +4, for tin +4

C

For lead +2, for tin +4

D

For lead +4 ,for tin +2

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaG^@ lt 0` so that `Pb^(4+) rarr Pb^(2+)`
or `Pb^(2+) ` is more stable than `Pb^(4+)`
`DeltaG^@ gt 0` i.e., nonspontaneous
so that `Sn^(4+)` is more stable than `Sn^(2+)`.
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  • The enthalpy of reaction: H_2(g) + 1//2 O_2(g) rarr H_2O(g) is Delta H_1 H_2(g) + 1//2 O_2(g) rarr H_2O(l) is Delta H_2

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