MCQ
Like other elements of d group, Zn does not show variable valence, because :
- AIt is a soft metal.
- ✓The d-orbital is completely filled in it.
- CIts melting point is low.
- DThere are two electrons in its outermost orbital.
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${A_{\left( s \right)}} + {B^ \oplus } \longrightarrow {A^ \oplus } + {B_{\left( s \right)}}\,;\,\Delta {H^o} = - 551.5\,KJ$ Calculate standard electrode potential of cell (in $volt$). .......... $\mathrm{volt}$
$Cl_2 + 2Br^ - (aq.) \to 2Cl^-(aq.) + Br_2$
$Br_2$ gas thus formed is dissolved into solution of $Na_2CO_3$ and then pure $Br_2$ is obtained by treatment of the solution with