Complete the missing components/variables given as x and y in the following reaction.

${Pb(NO}_{3})_{2} (aq) + 2 KI(aq) \to {PbI}_{2} (x) + 2 {KNO}_{3} (y)$

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Solution

These components represent the physical states of the reactants and the products.
$x \to (s)$
$y \to (aq)$

${Pb(NO}_{3})_{2} (aq) + 2 KI(aq) \to {PbI}_{2} (s) + 2 {KNO}_{3} (aq)$

Above reaction is a precipitation and a double displacement reaction in which solid precipitates of lead iodide are formed. Therefore x represents solid (s) form of lead iodide and y represents aqueous (aq) form of potassium nitrate.

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