- A$FBF$ bond angle $< 120^o$
- B$HNH$ bond angle $> 109^o28'$
- CExlubits intermolecular $H-$ bond
- ✓Hybridization of $N-$ atom is $sp^3$
$*\, FBF$ bond angle $< 120^o$ ($VSPER$ theory)
$* \,H N H$ bond angle is less than $120^o$ but greater than $109^o28$' due to back bonding.
$*$ Due to presence of $H-$ atom attached to nitrogen this molecule can exhibits intermolecular $H-$ bonding.
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$C(g) + 4H(g) \to C{H_4}(g),\,\Delta H = - {x_1}\,k\,cal$
$C{H_4}(g) \to C{H_3}(g) + H(g),\,\Delta H = + y\,k\,cal$
The bond energy of $C - H$ bond is
Assertion $(A) :$ At $10^{\circ} C$, the density of a $5\, M$ solution of $KCl$ [atomic masses of $K$ and $Cl$ are $39$ and $35.5\, g \,mol ^{-1}$ ]. The solution is cooled to $-21^{\circ} C$. The molality of the solution will remain unchanged.
Reason $(R):$ The molality of a solution does not change with temperature as mass remains unaffected with temperature.
In the light of the above statements, choose the correct answer from the options given below