MCQ
$Nd ^{2+}=$
- A$4 f^2 6 s^2$
- ✓$4 f^4$
- C$4 f^3$
- D$4 f ^4 6 s ^2$
$Nd ^{2+}=[ Xe ] 4 f ^4 5 d ^0 5 s ^0$
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$N_2(g) + 3H_2(g) \to 2NH_3(g$) is
$-92.38\, KJ$ at $298\, K$. The internal energy change $\left( {\Delta U} \right)$ at $298\, K$ is ........$KJ$
$H _2 O (\ell) \rightarrow H _2 O ( g )$
at $T =100^{\circ} C$ and $1$ atmosphere pressure, the correct choice is :
Here $A$ is nothing but :