KEAM 2016 Physics and Chemistry Paper

- Ni
3.23−(−0.44)=+0.21V
∆G∘=−nFE∘=(−2×0.21)F
∆G∘=−0.42F Platiimum -ve value of ∆G∘ is possible in
-ve, ∆G∘=+ ve and
ve, ∆G∘=− ve
(a), (b) and (c) give positive ∆G∘ (d) and (e) give ∆G∘ negative. But for ∆G∘ is more -ve.
Position of ammonium dichromate heating gives N2,Cr2O3 and H2O as

∆

⟶

N2+Cr2O3+4H2O