Neet 2025 PYQ

The standard heat of formation, in $\text{kcal/mol}$ of ${\text{Ba}}^{2+}$ is :[Given : standard heat of formation of ${\text{SO}}_4^{2-}(\text{aq})=-216\text{kcal/mol}$, standard heat of crystallisation of ${\text{BaSO}}_4(\text{s})=-4.5\text{kcal/mol}$, standard heat of formation of ${\text{BaSO}}_4(\text{s})=-349\text{kcal/mol}$ ]

Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula ${\text{C}}_4{\text{H}}_8\text{O}$ is :

Identify the correct orders against the property mentioned:A. ${\text{H}}_2\text{O}>{\text{NH}}_3>{\text{CHCl}}_3$ – dipole momentB. ${\text{XeF}}_4>{\text{XeO}}_3>{\text{XeF}}_2$ – number of lone pairs on central atomC. $\text{O-H}>\text{C-H}>\text{N-O}$ – bond lengthD. ${\text{N}}_2>{\text{O}}_2>{\text{H}}_2$ – bond enthalpyChoose the correct answer from the options given below :