MCQ
The calomel electrode used as a reference electrode has the substance
- A$PbO_2 -PbSO_4$
- B$HgCl_2$
- C$AgCl$
- ✓$Hg_2Cl_2$
In Calomel electrode:- A small amount of Mercury is placed at the bottom of the broad tube.
It is then covered with a saturated paste of Mercurous Chloride $\left( Hg _2 Cl _2\right)$ and mercury.
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The rate constants of the above reaction at $200 \,K$ and $300 \,K$ are $0.03 \,min ^{-1}$ and $0.05 \,min ^{-1}$ respectively. The activation energy for the reaction is $....J$ (Nearest integer)
(Given : In $10=2.3$
$R =8.3\,J\,K ^{-1}\, mol ^{-1}$
$\log 5=0.70$
$\log 3=0.48$
$\log 2=0.30$