What are the changes (change in state or colour; evolution of a gas; change in temp. ) during the reaction given below ?

Pb(NO₃)₂+ 2KI → PbI₂ + 3KNO₃

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Solution

Lead nitrate is white in colour, and its aqueous solution is colourless. When solutions of lead nitrate and potassium iodide are mixed together, then a yellow precipitate of lead iodide is formed. Hence, the reaction is accompanied by change in colour and formation of precipitate.

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Similar questions

Which of the following observations helps to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

{P b ({N O}_{3})}_{2} + 2 K I \to P b I_{2} + 2 K N O_{3}

While teaching the topic of physical and chemical changes, Mahima’s teacher listed the conditions that take place during a change.

I. Change in state

II. Change in colour

III. Evolution of a gas

IV. Change in temperature

He then asked Mahima to identify the conditions based on which it can be said with certainty that a particular change is chemical in nature.

Among the changes that are listed by the teacher, which changes should be selected by Mahima?

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