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In the preparation of KMnO4, pyrolusite ...

In the preparation of KMnO4, pyrolusite `(MnO_(2))` is first converted to potassium magnate `(K_(2)MnO_(4))`. In this conversion, the oxidation state of manganese changes from 

A

`+1" to "+3`

B

`+2" to "+4`

C

`+3" to "+5`

D

`+4" to "+6`

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-D - BLOCK ELEMENTS-PRACTICE EXERCISE
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  2. Highest oxidation state exhibited by a lanthanide element is

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  3. Lanthanides are rare earths, but one of them is not available naturall...

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  4. The element with highest number of unpaired L electrons is

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  5. Colour exhibited by divalent Sm in aqueous solutions

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  6. Which of the following is paramagnetic ?

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  7. Compound that is both paramagnetic and coloured is

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  8. Acidic oxide is formed by the metal and oxidation state of the metal i...

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  9. In the preparation of KMnO4, pyrolusite (MnO(2)) is first converted to...

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  10. Which of the following can be employed for the conversion of potassium...

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  11. The reaction MnO(4)^(-)+e^(-)hArrMnO(4)^(2) takes place in

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  12. When MnO(2) is fused with KOH in the presence of air, a coloured compo...

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  13. Acidified potassium dichromate is treated with hydrogen sulphide. In t...

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  14. The equivalent mass of K(2)Cr(2)O(7) when it acts as oxidising agent i...

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  15. The aqueous solution containing which one of the following ion will be...

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  16. Effective magnetic moment of Sc^(3+) ion is

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  17. The stable oxiation state of Cu, Ag and Au are respectively

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  18. Highest oxidation state exhibited by a lanthanide element is

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  19. Larger number of oxidation states are exhibited by the actinoids than ...

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  20. Zn gives H2 gas with H2SO4 and HCl but not with HNO3 because

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