MCQ
The molecular formula of the compound formed from B and C will be:
- A
- B$B _2 C$
- C$BC _2$
- D$BC _3$
Explanation:
B represent P and C represents Cl. The stable compound is PCl3 i.e., BC3.
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$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 .......... $\%$.
$(A)\,ZnO + Na_2O\rightarrow Na_2ZnO_2$
$(B)\,ZnO + CO_2\rightarrow ZnCO_3$