MCQ
The covalency of nitrogen in $HN{O_3}$ is
- A$0$
- B$3$
- C$4$
- ✓$5$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$H _{2}+\frac{1}{2} O _{2} \rightarrow H _{2} O , \cdots \cdots( ii )$ $\Delta H =-\,287.3 \,kJ\,mol ^{-1}$
$2 CO _{2}+3 H _{2} O \rightarrow C _{2} H _{5} OH +3 O _{2} \cdots \cdots ( iii )$; $ \Delta H =1366.8 \,kJ\,mol ^{-1}$
Find the standard enthalpy of formation of $C _{2} H _{5} OH (1)$

$(A)\,ZnO + Na_2O\rightarrow Na_2ZnO_2$
$(B)\,ZnO + CO_2\rightarrow ZnCO_3$

(Molecular Weight of $\mathrm{HNO}_{3}=63$ )