A small quantity of green coloured substance is heated. In the beginning it loses some water and then suffocating gas is evolved and a reddish brown residue is left behind. Answer the following:
i) What is the green coloured substance?
ii) Name the gas/ gases obtained in this reaction.
iii) Write the balanced chemical equation for the above reaction.

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Solution

Dear Student,
i) .Ferrous Sulphate ( FeSO₄)
ii) .Sulphur dioxide ( SO₂),Sulphur trioxide ( SO₃)
iii ( FeSO4 . 7H₂O ) green vitriol $\overset{h e a t}{\to}$ ( Fe₂O₃) +( SO₂)+ ( SO₃)
.Ferrous Sulphate Ferric Oxide Sulphur dioxide Sulphur trioxide

Regards.

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small quantity of light green coloured substance is heated .in the beginning, it loses some water
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Question 39
On heating blue-colored powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas, and a brown gas X are formed

(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
(d) What could be the pH range of the aqueous solution of the gas X?

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Dear Student, i) .Ferrous Sulphate ( FeSO4) ii) .Sulphur dioxide ( SO2),Sulphur trioxide ( SO3) iii ( FeSO4 . 7H2O ) green vitriol →heat( Fe2O3) +( SO2)+ ( SO3) .Ferrous Sulphate Ferric Oxide Sulphur dioxide Sulphur trioxide Regards.

Dear Student,
i) .Ferrous Sulphate ( FeSO₄)
ii) .Sulphur dioxide ( SO₂),Sulphur trioxide ( SO₃)
iii ( FeSO4 . 7H₂O ) green vitriol $\overset{h e a t}{\to}$ ( Fe₂O₃) +( SO₂)+ ( SO₃)
.Ferrous Sulphate Ferric Oxide Sulphur dioxide Sulphur trioxide

Regards.