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Q.

How many of the following are correct

A)2KCl{O_3} to 2KCl + 3{O_2}  --  Intramolecular redox

 B)2H_2O_2rightarrow 2H_2O+O_2 --  Disproportionation

C)2KMnO_4rightarrow K_2MnO_4+MnO_2+O_2  --  Intramolecular redox

D)2HgOrightarrow 2Hg+O_2  --   Intramolecular redox

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a

A,B,C,D

b

A,B only

c

A,C,D only

d

C,D only

answer is A.

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Detailed Solution

begin{array}{l} A)2Kmathop {Cl}limits^{ + 5} mathop {{O_3}}limits^{ - 2} to 2Kmathop {Cl}limits^{ - 1} + 3mathop {{O_2}}limits^0 \ C)2Kmathop {Mn}limits^{ + 7} mathop {{O_4}}limits^{ - 2} to {K_2}mathop {Mn}limits^{ + 6} {O_4} + mathop {Mn}limits^{ + 4} {O_2} + mathop {{O_2}}limits^0 \ D)2mathop {Hg}limits^{ + 2} mathop Olimits^{ - 2} to 2mathop {Hg}limits^0 + mathop {{O_2}}limits^0 end{array}

In all these reactions , in the same molecule , one atom undergoes oxidation

and the other atom undergoes reduction

These are Intramolecular redox reactions

B)2{H_2}mathop {{O_2}}limits^{ - 1} to 2{H_2}mathop Olimits^{ - 2} + mathop {{O_2}}limits^0

In this reaction same element (oxygen) undergoes both oxidation & reduction

This is a disproportion reaction

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