Question

Which of the following reactions are disproportionation reactions?
$$\left( {\text{i}} \right)C{u^ + } \to C{u^{2 + }} + Cu$$
$$\left( {{\text{ii}}} \right)3MnO_4^{2 - } + 4{H^ + } \to $$     $$2MnO_4^ - + Mn{O_2} + 2{H_2}O$$
$$\left( {{\text{iii}}} \right)2KMn{O_4} \to $$    $${K_2}Mn{O_4} + Mn{O_2} + {O_2}$$
$$\left( {{\text{iv}}} \right)2MnO_4^ - + 3M{n^{2 + }} + 2{H_2}O$$       $$ \to 5Mn{O_2} + 4{H^ + }$$

A. (i), (ii)  
B. (i), (ii), (iii)
C. (ii), (iii), (iv)
D. (i), (iv)
Answer :   (i), (ii)
Solution :
In (i), $$C{u^ + }$$  is oxidised as well as reduced. In (ii), $$MnO_4^{2 - }$$  ions are oxidised as well as reduced.

Releted MCQ Question on
Inorganic Chemistry >> D and F Block Elements

Releted Question 1

When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volume of hydrogen evolved is

A. $$1:1$$
B. $$1:2$$
C. $$2:1$$
D. $$9:4$$
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Releted Question 2

Which of the following is the weakest base

A. $$NaOH$$
B. $$Ca{\left( {OH} \right)_2}$$
C. $$KOH$$
D. $$Zn{\left( {OH} \right)_2}$$
View Answer
Releted Question 3

One of the constituent of German silver is

A. $$Ag$$
B. $$Cu$$
C. $$Mg$$
D. $$Al$$
View Answer
Releted Question 4

Which of the following dissolve in hot conc.$$NaOH$$  solution

A. $$Fe$$
B. $$Zn$$
C. $$Cu$$
D. $$Ag$$
View Answer

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D and F Block Elements

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