MCQ
Bond angles $104^o, 117^o$ and $180^o$ are associated with
- A$NH_3, NO_2^-$ and $NO_2^+$ respectively
- B$H_2O, NH_3$ and $CO_2$ respectively
- C$H_2O, O_3$ and $NO_2^-$ respectively
- ✓$H_2O, O_3$ and $CO_2$ respectively
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$2CrO_4^{2 - } + 2{H^ + } \to C{r_2}O_7^{2 - } + {H_2}O$
$CH_3OH(l)+ \frac{3}{2} O_2 (g) $$\rightarrow CO_2 (g)+ 2H_2O(l)$
At $298\, K$ standard Gibb's energies of formation for $CH_3OH(l),H_2O(l)$ and $CO_2 (g)$ are $-166.2,-237.2$ and $-394.4\, kJ\,mol^{-1}$ respectively. If standard enthalpy of combustion of methonal is $-726 \,kJ\, mol^{-1},$ efficiency of the fuel cell will be .......... $\%$.