MCQ
Which of the following is non-conducting ?
- A$CoCl_3.6NH_3$
- B$CoCl_3.5NH_3$
- C$CoCl_3.4NH_3$
- ✓$CoCl_3.3NH_3$
But other complex give atleast one ion so they are conductor.
$CoCl _3 .4 NH _3$ gives two ion (one complex $+$ one chloride).
$CoCl _3 .5 NH _3$ gives three ion (one complex $+$ two chloride).
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$A$ || $B$
$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 .......... $\%$.
(Given : atomic number $Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61 \text { ) }$
$A.$ $Sm$ $B.$ $Eu$ $C.$ $Tb$ $D.$ $Gd$ $E.$ $Pm$
Choose the correct answer from the options given below: