MCQ
Select the incorrect option, when a lead storage battery is discharged -
- ✓$SO_2$ is evolved
- BLead sulphate is produced at both electrodes
- CSulphuric acid is consumed
- DWater is formed
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$F{e^{2 + }} + 2{e^ - } \to Fe( - 0.44\,V)$
$N{i^{2 + }} + 2{e^ - } \to Ni( - 0.25\,V)$
$S{n^{2 + }} + 2{e^ - } \to Sn( - 0.14V)$
$F{e^{3 + }} + {e^ - } \to F{e^{2 + }}( - 0.77\,V)$
$A\xrightarrow[(ii)\;H_3O^+]{(i)\;CH_3MgBr}B\xrightarrow[573\;K]{Cu}2-$methyl $2-$butene
The mass percentage of carbon in $A$ is
$n - Pr = n -$ propyl
Product' $(A)$ is