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ICSE Class 10 Chemistry Question 16 of 22

Solved 2024 Question Paper ICSE Class 10 Chemistry — Question 13

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13
Question

Question 6(i)

X - HCl ⇋ H1+ + Cl- (in solution state)

Y - PbBr2 ⇋ Pb2+ + 2Br1- (in molten state)

From the above reactions X or Y, identify the reaction which exhibits:

(a) electrolytic dissociation

(b) ionization

Answer

(a) Y is electrolytic dissociation.

Reason — PbBr2 is an electrovalent compound and its contains lead [Pb2+] and bromide [Br1-] ions that are held together by an electrostatic force of attraction. Melting causes the separation of these ions. Hence, it exhibits electrolytic dissociation.

(b) X is ionization.

Reason — HCl is a polar covalent compound. In gaseous state or pure liquid state, it does not conduct an electric current. When HCl is added to water, formation of Hydronium [(H3O)+] and Chloride [Cl-] ions takes place. Hence, it exhibits ionization.