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When MnO2 is fused with KOH in the prese...

When `MnO_2` is fused with KOH in the presence of `KNO_2` as an oxidising agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises KI to compound (C) whereas an acidified solution of compound (B) oxidises KI to (D). Identify (A), (B), (C), and (D).

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MODERN PUBLICATION-D AND F-BLOCK ELEMENTS-REVISION EXERCISES ( SHORT ANSWER QUESTION)
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  2. Calculate the number of unpaired electrons in Cr^(3+) and V^(3+) io...

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  3. How will you account for the following: (a) Actinoids exhibit more num...

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  5. (a) Define transition metals. (b) Why do transition metals form colour...

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  6. (a) What is lanthanoid contraction and write its consequences ? (b) Dr...

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  7. (a) Why are Zn, Cd and Hg not regarded as transition metals? (b) Why d...

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  8. (a) How will you prepare KMnO4 from pyrolusite ore ? (b) Complete the...

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  10. (a) Indicate the steps in the preparation of K2Cr2O7 from chromite ore...

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  11. When MnO2 is fused with KOH in the presence of KNO2 as an oxidising ag...

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  12. Give reasons for the following: (i) Transition elements and their co...

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  13. Give reasons for the following: (i) Transition metals form alloys....

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  14. How would you account for the following? (i) Cr^(2+) is reducing...

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  15. How would you account for the following ? (i) Among lanthanoids, ...

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  16. Explain the following observations: (i) Many of the transition element...

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  17. Why do the transition elements have higher enthalpies of atomisation? ...

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