Short Answer Questions
1) What is electrolytic decomposition? Give one application.
2) How is exothermic reaction different from an endothermic reaction?
3) On adding a drop of Barium Chloride solution to an aqueous solution of Sodium Sulphite, white precipitate is obtained.
A) Write a balanced chemical equation of the reaction involved.
B) What other name can be given to this precipitation reaction?
C) On adding dilute Hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
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1) It is the breakdown of ionic compounds by the use of electricity.
- This is done during Electrolysis and also for Extraction of Aluminium (electricity breaks down Al2O3, which then separated as Al and O2)
2) - Exothermic reactions release heat during the reaction, where the products are less energetic than the reactants.
- Endothermic reactions gain heat during the reaction, where the products are more energetic than the reactants.
3) A) [tex]BaCl_{2}[/tex] (aq) + [tex]Na_{2}SO_{3}[/tex] (aq) ⇒ [tex]BaSO_{3}[/tex] (s) + 2 [tex]NaCl[/tex] (aq)
B) Double Displacement Reaction
C) The white precipitate ( Barium Sulphite ) reacts with the acid HCl and dissolves in the solution. The equation is :
[tex]BaSO_{3}[/tex] +2 [tex]HCl[/tex] ⇒ [tex]BaCl_{2}[/tex] + [tex]SO_{2}[/tex] + [tex]H_{2} O[/tex]
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