PART - 2 CH - 8 Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

$A$. Hydrogen bonding exists when $\mathrm{H}$ is covalently bonded to the highly electro negative atom.

$B$. Intermolecular $\mathrm{H}$ bonding is present in o-nitro phenol

$C$. Intramolecular $\mathrm{H}$ bonding is present in $\mathrm{HF}$.

$D$. The magnitude of $\mathrm{H}$ bonding depends on the physical state of the compound.

$E$. H-bonding has powerful effect on the structure and properties of compounds.

Choose the correct answer from the options given below :

${N_2}{H_4}(l)\,+\,2{H_2}{O_2}(l)\,\, \to \,{N_2}(g)\,\, + \,4{H_2}O(l);\,\,{\Delta _r}H_1^o\, = \, - 818\,\,kJ/mol$

${N_2}{H_4}(l)\,\, + {O_2}(g)\,\, \to \,{N_2}(g)\,\, + \,2{H_2}O(l);\,\,{\Delta _r}H_2^o\, = \, - 622\,\,kJ/mol$

${H_2}(g)\,\, + 1/2{O_2}(g)\,\, \to \,{H_2}O(l);\,\,{\Delta _r}H_3^o\, = \, - 285\,\,kJ/mol$

......$kJ/mol$