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Q.

How many of the following are correct

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

$B)2H_2O_2\rightarrow 2H_2O+O_2$ -- Disproportionation

$C)2KMnO_4\rightarrow K_2MnO_4+MnO_2+O_2$ -- Intramolecular redox

$D)2HgO\rightarrow 2Hg+O_2$ -- 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

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

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

and the other atom undergoes reduction

These are Intramolecular redox reactions

$B)2{H_2}\mathop {{O_2}}\limits^{ - 1} \to 2{H_2}\mathop O\limits^{ - 2} + \mathop {{O_2}}\limits^0$

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

This is a disproportion reaction

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