4. Write the chemical equation of the reaction in which the following changes have taken
place with an example of each:
(i) Change in colour
(1) Change in temperature
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Explanation:
(i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution.
Pb(NO3)2(aq)+2KI → PbI2(s)+2KNO3(aq)
In this reaction, colour changes from colourless to yellow.
(ii) Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2
In this reaction, heat is evolved
Hope it helps you :)☺
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