How will we come to know which colour precipitate is formed in the double displacement reaction?

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Q. When double displacement reaction of an aqueous solution of lead (II) nitrate and aqueous solution of potassium sulfate occurs, precipitate form will be?

Q. Identify the double displacement reaction which does not involve a precipitate formation.

K_{2} C O_{3} (a q) + C a {(O H)}_{2} (a q) \to {CaCO}_{3} ⏐ ↓ (s) + 2 KOH (aq)

The above reaction is an example of ______ reaction and the precipitate formed in this reaction is ______ .

(a) When you have mixed the solutions of lead(II) nitrate and potassium iodide,
(i) what was the colour of the precipitate formed and can you name the precipitate?
(ii) write the balanced chemical equation for this reaction.

(b) What is the difference between displacement and double displacement reactions? Write equations for these reactions.

The following equation represents double displacement reaction, what is the precipitate formed in this reaction?

$A g N O_{3} (a q) + N a I (a q) \to A g I (s) + N a N O_{3} (a q)$

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