8.1. Organic chemistry Nomenclature of organic compounds — Chemistry STD 11 Science — Question

$(i)\, {\Delta _f}{H^o}$ of $N_2O$ is $82\, kJ\, mol^{-1}$

$(ii)$ Bond energies of $N \equiv N,N = N,O = O$ and $N = O$ are $946, 418, 498$ and $607\, kJ\, mol^{- 1}$ respectively

The resonance energy of $N_2O$ is......$kJ$

$A.$ $I _2( g ) \rightarrow 2 I ( g )$

$B.$ $HCl ( g ) \rightarrow H ( g )+ Cl ( g )$

$C.$ $H _2 O ( l ) \rightarrow H _2 O ( g )$

$D.$ $C ( s )+ O _2( g ) \rightarrow CO _2( g )$

$E.$ Dissolution of ammonium chloride in water

$(A)$ If empirical formula of compound $3$ is $P_3 Q_4$, then the empirical formula of compound $2$ is $P_3 Q_5$.

$(B)$ If empirical formula of compound $3$ is $P _3 Q _2$ and atomic weight of element $P$ is $20$ , then the atomic weight of $Q$ is $45$ .

$(C)$ If empirical formula of compound $2$ is $PQ$, then the empirical formula of the compound $1$ is $P _5 Q _4$.

$(D)$ If atomic weight of $P$ and $Q$ are $70$ and $35$ , respectively, then the empirical formula of compound $1$ is $P _2 Q$.