MCQ
$B{e^{2 + }}$ is isoelectronic with
- A$M{g^{2 + }}$
- B$N{a^ + }$
- ✓$L{i^ + }$
- D${H^ + }$
Both contain $2$ electrons.
They have an electronic configuration $Be ^2=1 s ^2= Li ^{+}$.
This is equal to the electronic configuration of $He$.
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$MnO_2+ 4HCl \to MnCl_2 + 2H_2O + Cl_2$
If molar mass of hydrochloric acid is $M$.
$2 A ( g ) \rightarrow A _{2}( g )$
at $298\, K , \Delta U^ \ominus,=-20\, kJ\, mol ^{-1}, \Delta S \odot=-30\, J$$K ^{-1}\, mol ^{-1},$ then the $\Delta G ^{\ominus}$ will be........$J$