$M n O_{2}, P b O_{2}$ and red lead react with conc. HCI acid to liberate $C l_{2}$ .
(a) What is the common property being shown by these metal oxides?
(b) Write a balanced equation for the following reaction: $P b_{3} O_{4}$ + Conc. HCI.
(c) What kind of compound can be added to bleaching powder to obtain $C l_{2}$ . [5 MARKS]

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Solution

a) 1 Mark
b) 2 Marks
c) 2 Marks

(a) All these metal oxides act as oxidising agents.

(b) $P b_{3} O_{4} + 8 H C I \to 3 P b C l_{2} + 4 H_{O} + C l_{2}$

(c) Dilute acid such as dil. HCl or dil. $H_{2} S O_{4}$
$C a O C l_{2} + 2 H C I \to C a C l_{2} + H_{2} O + C l_{2}$

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Manganese (IV) oxide, lead (IV) oxide and red lead (Pb₃O₄) react with concentrated hydrochloric acid to liberate chlorine.
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MnO2,PbO2 and red lead react with conc. HCI acid to liberate Cl2. (a) What is the common property being shown by these metal oxides? (b) Write a balanced equation for the following reaction: Pb3O4 + Conc. HCI. (c) What kind of compound can be added to bleaching powder to obtain Cl2. [5 MARKS]

a) 1 Mark b) 2 Marks c) 2 Marks (a) All these metal oxides act as oxidising agents. (b) Pb3O4+8HCI→ 3PbCl2+4HO+Cl2 (c) Dilute acid such as dil. HCl or dil. H2SO4 CaOCl2+2HCI→ CaCl2+H2O+Cl2

a) 1 Mark
b) 2 Marks
c) 2 Marks

(a) All these metal oxides act as oxidising agents.

(b) $P b_{3} O_{4} + 8 H C I \to 3 P b C l_{2} + 4 H_{O} + C l_{2}$

(c) Dilute acid such as dil. HCl or dil. $H_{2} S O_{4}$
$C a O C l_{2} + 2 H C I \to C a C l_{2} + H_{2} O + C l_{2}$