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(B) $FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$ is a double salt known as Mohr's salt.When dissolved in water,it dissociates completely into its constitue

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$5$

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(B) $FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$ is a double salt known as Mohr's salt.When dissolved in water,it dissociates completely into its constituent ions.The dissociation reaction is:$FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O (aq) \rightarrow Fe^{2+} (aq) + 2NH_4^+ (aq) + 2SO_4^{2-} (aq) + 6H_2O (l)$The total number of ions produced is $1 (Fe^{2+}) + 2 (NH_4^+) + 2 (SO_4^{2-}) = 5$ ions.

The number of ions produced when one molecule of $FeSO_4 \cdot (NH_4)_2SO_4 \cdot 6H_2O$ is dissolved in water is ...............

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