Q27 of 44 Page 5

Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.


The thermal decomposition or thermolysis of Ferrous Sulphate results in the formation of Iron (III) Oxide and Sulphur dioxide and sulphur trioxide.


2FeSO4 + Heat → Fe2O3 + SO2 + SO3


Sulphur dioxide is the gas that has a distinctive odour of burning sulphur. The type of reaction is Thermal decomposition.


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Write the balanced chemical equations for the following reactions

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogen carbonate.


(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.


(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide (Cu2 I2), liberates iodine gas and also forms potassium sulphate.

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A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction?

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Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?