What is the stoichiometric coefficient fo Ca in the reaction ?
`Ca+Al^(3+) rarr Ca^(2+)+Al`

Options

A. 2
B. 1
C. 3
D. 4

Answer

C

Explanation

`[Ca rarr Ca^(2+)+2e^(-)]xx3`
`[Al^(3+)+3e^(-) rarr Al]xx2`
`3Ca rarr 3Ca^(2+)+6e^(-)`
`2Al^(3+)+6e^(-) rarr 2Al`
`bar(3Ca+2 Al^(3+) rarr 3 Ca^(2+)+2 Al)`
Therefore, the stoichiometric coefficient of Ca in the given reaction is 3.