Question

. A green coloured salt on heating, first changes to a white solid along with formation of a colourless liquid, and then to a brown residue with the evolution of 2 gases which turn moist blue litmus paper red.
A) Name the green coloured salt
B) Why does the green salt become white
C) Name the colourless liquid and write the equation for this change
D) Name the brown residue formed
E) What are the gases formed in this reaction
F) Why does the blue litmus turn red
G) Write a balanced chemical equation for this reaction

Answer 1

Answer:

A) Iron Sulphate.

B) On heating, molecules physically bound to Iron Sulphate, which gives it a green colour, evaporates. Thus it leaves white coloured Iron Sulphate behind.

C) The colourless liquid is Water.

Equation :

FeSO4•7 H2O + ∆H -----> FeSO4 + 7 H2O.

D) Ferric Oxide.

E) Sulphur Dioxide and Sulphur Trioxide.

F) When Sulphur dioxide and Sulphur Trioxide comes in contact with moist blue litmus, it gets dissolved in water molecules present in the blue litmus, forming Sulphurous Acid and Sulphuric acid respectively, which changes blue litmus, red.

G) 2 FeSO4 (s) + ∆H ------> Fe2O3 (s) + SO2 (g) + SO3 (g).

Explanation:

Hope this helps!!!!!