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MnO(2) is the most important oxide of ma...

`MnO_(2)` is the most important oxide of manganese , `MnO_(2)` occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to `Mn_(3)O_(4)` on heating to `530^(@)`C. It is used in the preparation of potassium permanaganate and in the productioon of `Cl_(2)` gas. Over half million tonnes per year of `MnO_(2)` is used in dry batteries.
Q. When `MnO_(2)` is fused with KOH in the presence of air, the product formed is:

A

Purple colour `KMnO_(4)`

B

Green colour `K_(2)MnO_(4)`

C

Colourless `MnO_(4)^(-)`

D

Purple colour `K_()MnO_(4)`

Text Solution

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The correct Answer is:
B
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MnO_(2) is the most important oxide of manganese , MnO_(2) occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_(3)O_(4) on heating to 530^(@) C. It is used in the preparation of potassium permanaganate and in the productioon of Cl_(2) gas. Over half million tonnes per year of MnO_(2) is used in dry batteries. Q. In the laboratory, MnO_(2) is made by:

MnO_(2) is the most important oxide of manganese , MnO_(2) occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_(3)O_(4) on heating to 530^(@) C. It is used in the preparation of potassium permanaganate and in the productioon of Cl_(2) gas. Over half million tonnes per year of MnO_(2) is used in dry batteries. Q. In the laboratory, MnO_(2) is made by:

MnO_(2) is the most important oxide of manganese , MnO_(2) occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_(3)O_(4) on heating to 530^(@) C. It is used in the preparation of potassium permanaganate and in the productioon of Cl_(2) gas. Over half million tonnes per year of MnO_(2) is used in dry batteries. Q. MnO_(2) dissolves in concentrated HCl to form:

MnO_(2) is the most important oxide of manganese , MnO_(2) occurs natually as the black coloured mineral pyrolusite. It is an oxidising agent, and decomposes to Mn_(3)O_(4) on heating to 530^(@) C. It is used in the preparation of potassium permanaganate and in the productioon of Cl_(2) gas. Over half million tonnes per year of MnO_(2) is used in dry batteries. Q. In which of the following species, the colour is due to charge transfer? (I) [Mn(OH)_(4)]^(2-) (II) MnO_(4)^(2-) (III) MnO_(4) (IV) KMnO_(4)

When MnO_(2) is fused with KOH , a coloured compound is formed. The product and its colour is

What is the oxidation state of : Manganese in MnO_2

When MnO_(2) fused with KOH , a coloured compound is formed . The product and its colour is:

Oxidation state exhibited by Mn in MnO_(2) is

The oxidation state of Mn in MnO_4^(2-) is

Oxidation number of Mn in K_(2)MnO_(4) is

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