Q26 of 44 Page 5

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?


When a solution of Potassium Chloride is mixed with Silver Nitrate solution, we get a precipitate of Silver Chloride. Chlorides are usually soluble but one important exception to this rule is Silver Chloride.
 The chemical reaction is KCl + AgNO3 → KNO3 (aq)+ AgCl(s)

This type of chemical reaction is called a double displacement reaction.


Note: A double displacement reaction is a type of chemical reaction in which two chemical compounds react and the positive ions and the negative ions of the two compounds switch places.


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Identify the oxidising agent (oxidant) in the following reactions

(a) Pb3O4 + 8HCl ⎯→ 3PbCl2 + Cl2 + 4H2O


(b) 2Mg + O2⎯→ 2MgO


(c) CuSO4 + Zn ⎯→ Cu + ZnSO4


(d) V2O5 + 5Ca ⎯→ 2V + 5CaO


(e) 3Fe + 4H2 O ⎯→ Fe3O4 + 4H2


(f) CuO + H2⎯→ Cu + H2O

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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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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.

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