Question

Write the chemical equation of the reaction in which the following changes
have taken place with an example of each:
() Change in colour
(11) Change in temperature
(im) Formation of precipitate​

Answer 1

Answer:

(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

(iii) Formation of precipitate:

Action of barium chloride on sodium sulphate.

BaCl2(aq) +Na2SO4(aq) →  BaSO4(s) +2NaCl(aq)

BaSO4(s) - ppt

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