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  4. What is the stoichiometric coefficient of Ca in the reaction? Ca + Al3+ → Ca2+ + Al

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Q. What is the stoichiometric coefficient of $Ca$ in the reaction?
$Ca + Al^{3+} \to Ca^{2+} + Al$

UP CPMTUP CPMT 2007

Solution:

$[Ca \to Ca^{2+}+2e^{-}]\times 3$
$[Al^{3+}+3e^{-}\to Al] \times 2]$
$\frac{\begin{matrix}\begin{matrix}3Ca \to3Ca^{2+}+6e^{-}\\ 2Al^{3+}+6e^{-} \to2Al\end{matrix}\end{matrix}}{3Ca+2Al^{3+}\to3Ca^{2+}+2Al}$
Therefore, the stoichiometric coefficient of Ca in the given reaction is $3$