- A$[CoF_4]^{-2}$
- B$[Co(H_2O)_4]^{-2}$
- C$[CoCl_4]^{-2}$
- ✓$[Co(NH_3)_6]^{+3}$
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$6 \mathrm{OH}^{-}+\mathrm{Cl}^{-} \rightarrow \mathrm{ClO}_{3}^{-}+3 \mathrm{H}_{2} \mathrm{O}+6 \mathrm{e}^{-}$
A current of $x A$ has to be passed for $10 h$ to produce $10.0 \mathrm{~g}$ of potassium chlorate. The value of $\mathrm{x}$ is $.......$ (Nearest integer)
(Molar mass of $\left.\mathrm{KClO}_{3}=122.6 \mathrm{~g} \mathrm{~mol}^{-1}, \mathrm{~F}=96500 \mathrm{C}\right)$

$\mathop {{C_4}{H_8}}\limits_{{\text{Cyclobutane}}} \xrightarrow{{Heat}}2{C_2}{H_4}$ The rate constant is $2.3 \times 10^{-4}\ sec^{-1}.$ In what time will the molar ratio of the ethylene to cyclobutane in reaction mixture attain the value $1$ ? ...... $\min$
$(b)$ $CoCl _{3} \cdot 5 NH _{3}$
$(c)$ $CoCl _{3} \cdot 6 NH _{3}$ and
$(d)$ $CoCl \left( NO _{3}\right)_{2} \cdot 5 NH _{3}$
Number of complex(es) which will exist in cistrans is/are ....
