MCQ
If the aufbau principle had not been foll owed. $Ca (Z = 20)$ would have been placed in the
- A$s-block$
- B$p-block$
- ✓$d-block$
- D$f-block$
Filling of $3 d$ orbital starts after the filling of $4 s$ orbitals. If the Aufbau principle had not been followed, the filling of $3 d$ orbital would have been prior to filling of $4 s$ orbital and the electronic configuration of $Ca$ would have been $1 s ^2\, 2 s ^2 \,2 p ^6\, 3 s ^2\, 3 p ^6 \,3 d ^2$ and it would have been placed in the $d$-block.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$NO_{(g)} + \frac{1}{2}{O_2} \rightleftharpoons N{O_2}_{(g)}$
$2N{O_2}_{(g)} \rightleftharpoons 2NO_{(g)} + {O_2}_{(g)}$
$2P(s) + 3C{l_2}(g)\,\, \to \,\,2PC{l_3}(l);\,\Delta H = - 151.8\,kcal$
$PC{l_3}(l) + C{l_2}(g)\,\, \to \,\,PC{l_5}(s);\,\,\Delta H = - 32.8\,kcal$
......$kcal$