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- B

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Compare the bond lengths $a$ and $b$
$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 .......... $\%$.
$(a)$ saline hydrides produce $H_2$ gas when reacted with $H_2O.$
$(b)$ reaction of $LiAH_4$ with $BF_3$ leads to $B_2H_6.$
$(c)$ $PH_3$ and $CH_4$ are electron - rich and electron-precise hydrides, respectively.
$(d)$ $HF$ and $CH_4$ are called as molecular hydrides.
(Molar mass of $Ca(OH)_2, Na_2SO_4$ and $CaSO_4$ are $74, 143$ and $136\, g\, mol^{-1}$ respectively; $K_{sp}$ of $Ca(OH)_2$ is $5.5 \times 10^{-6}$)