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Question

When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.
(a) What do you think substance X is likely to be?
(b) Name the substance which the yellow solid consists of.
(c) Which characteristic of chemical reaction is illustrated by this example?
(d) Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.

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Solution

(a) Substance X is likely to be lead nitrate, because on reacting with potassium iodide it forms a yellow precipitate.

(b) The yellow solid or precipitate consists of lead iodide, which is one of the products in this reaction.

(c) This chemical reaction is characterised by the formation of precipitate.

(d) 2KI (s) + Pb(NO3)2 (aq) PbI2 (s) + 2KNO3 (aq)


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