Question

When a green iron salt is heated strongly, it's colour finally changes to brown and odour of burning sulphur is given out .
(a) Name the iron salt.
(b) Name the type of reaction that takes place during the heating of iron salt.
(c) Write a chemical eqation for the reaction involved.

Answer 1

It is a decomposition reaction of Ferrous Sulfate into Ferric oxide, Sulfur dioxide and Sulfur trioxide.

The iron salt is Ferrous sulfate.

Chemical equation - FeSO4 --> Fe2O3 + SO2 + SO3

Here,

FeSO4 is green colored, when it is heated, it changes to Fe2O3 which is a brown colored compound.

Answer 2

Answer :

a) The Iron salt in this case is Iron Sulphate.

b) Decompostion reaction takes place during the heating of iron salt.

{ Thermal decomposition. }

c) Chemical Equation -

$\sf FeSO4 \rightarrow Fe2O3 + SO2 + SO3$

Note -

The reaction is thermal decomposition.

{ Kind of Decompostion reaction. }

Well, FeSO4 is green colored. But when it gets heated, it turns into Fe2O3.

As we know Fe2O3 which is a brown compound.

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Decomposition Reaction :

Decomposition is the breaking up of a single compound into two or more simpler products. Energy is needed to break bonds.

Thermal decomposition is the use of heat to break down a compound. When copper carbonate it changes to a black powder. The green copper carbonate breaks black dioxide gas.