Write one chemical equation each for the chemical reaction in which the following have taken place : (i)…
Write one chemical equation each for the chemical reaction in which the following have taken place :
(i) Change in colour
(ii) Change in temperature
(iii) Formation of precipitate
Mention colour change/temperature change (rise/fall)/compound precipitated along with equation.
Solution
(i) Change in colour: The solution will become green in colour.
Fe(s) + CuSO4(aq) → FeSO4 + Cu(s)
Blue Green
(or any other reaction which shows change in colour)
(ii) Change in temperature: The temperature will increase.
NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) + Heat
(or any other reaction which shows change in temperature)
(iii) Formation of precipitate: Yellow precipitate of PbI2 is formed.
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)
Yellow
(or any other reaction which shows formation of precipitate)