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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. `MnO_(2)` dissolves in concentrated HCl to form:

A

`Mn^(4+)` ion and `Cl_(2)`

B

`Mn^(2+)` ion and `Cl_(2)`

C

`[MnCl_(4)]^(2-) and Cl_(2)`

D

only `[MnCl_(4)]^(2-)`

Text Solution

Verified by Experts

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. When MnO_(2) is fused with KOH in the presence of air, the product formed is:

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)

Assertion (A) : Pink coloured solution of potassium permanganate turns green on passing O_3 through it. Reason (R) : K_2MnO_4 is oxidised by O_3 to KMnO_4 .

One mole of KClO_(3) is heated in presence of MnO_(2) . The produced oxygen is used in burning of Al. Then oxide of Al that will be formed.

What is the ratio of moles of MnO_4^(ɵ) used per " mol of " C_2O_4^(2-) in acidic medium to strong basic medium?

Pyrolusite is the main ore of manganese in which it is present as Its Mn content is determined by reducing it under acidic condition to Mn^(2+) with the help of oxalate (C_(2)O_(4)^(2-)) ion which in turn gets oxidized to CO_(2) The analytical determination is carried out by adding a known excess volume of (C_(2)O_(4)^(2-)) solution to a suspension of the pyrolusite and digesting the mixture on a hot water bath until all the MnO_(2) has been reduced. The excess unreacted oxalate solution is then titrated with standardized KMnO_(4) solution. Thereby Mn content of ore can be calculated. KMnO_(4) solution is also standardized under acidic condition against oxalate ion wherein MnO_(4)^(-) ion is reduced to Mn^(2+) and (C_(2)O_(4)^(2-)) ion is oxidized to CO_(2) Q If a student prepared a standard solution of Na_(2)C_(2)O_(4) by dissolving 3.2 g of dry anhydrous salt into distilled water and making the solution upto 500 mL. The Normality of oxalate solution is

Pyrolusite is the main ore of manganese in which it is present as Its Mn content is determined by reducing it under acidic condition to Mn^(2+) with the help of oxalate (C_(2)O_(4)^(2-)) ion which in turn gets oxidized to CO_(2) The analytical determination is carried out by adding a known excess volume of (C_(2)O_(4)^(2-)) solution to a suspension of the pyrolusite and digesting the mixture on a hot water bath until all the MnO_(2) has been reduced. The excess unreacted oxalate solution is then titrated with standardized KMnO_(4) solution. Thereby Mn content of ore can be calculated. KMnO_(4) solution is also standardized under acidic condition against oxalate ion wherein MnO_(4)^(-) ion is reduced to Mn^(2+) and (C_(2)O_(4)^(2-)) ion is oxidized to CO_(2) Q of pyrolusite ore were treated with of pure ferrous ammonium sulphate FeSO_(4).(NH_(4))_(2)SO_(4)6h_(2)O) and dil. H_(2)SO_(4) After the reaction solution was diluted to . of dilute solution required 10 mL of 0.1NK_(2)Cr_(2)O_(7) solution. What is the amount of ferrous ammonium sulphate in 500 mL of solution, which is neutralized by K_(2)Cr_(2)O_(7) solution ?

Pyrolusite is the main ore of manganese in which it is present as Its Mn content is determined by reducing it under acidic condition to Mn^(2+) with the help of oxalate (C_(2)O_(4)^(2-)) ion which in turn gets oxidized to CO_(2) The analytical determination is carried out by adding a known excess volume of (C_(2)O_(4)^(2-)) solution to a suspension of the pyrolusite and digesting the mixture on a hot water bath until all the MnO_(2) has been reduced. The excess unreacted oxalate solution is then titrated with standardized KMnO_(4) solution. Thereby Mn content of ore can be calculated. KMnO_(4) solution is also standardized under acidic condition against oxalate ion wherein MnO_(4)^(-) ion is reduced to Mn^(2+) and (C_(2)O_(4)^(2-)) ion is oxidized to CO_(2) Q An alternative method for this analysis may be the replacement of oxalate with Fe^(2+) But this is less frequently used because it requires some special care otherwise we get low analytical results. The probable reaction responsible for this fact is :

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