Question

Write the chemical equation of the reaction in which the following changes have taken place with an example of each: ( Change in colour (ii) Change in temperature (iii) Change in state ​

Answer 1

Explanation:

Change in temperature:

Action of dilute sulphuric acid on zinc.

Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2

In this reaction, heat is evolved.

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.

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