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When orange solution containing Cr2O7^(2...

When orange solution containing `Cr_2O_7^(2-)` ion is treated with an alkali, a yellow solution is formed and when `H^+` ions are added to yellow solution, an orange solution is obtained. Explain why does this happen ?

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MODERN PUBLICATION-d-AND f- BLOCK ELEMENTS-EXERCISE
  1. When orange solution containing Cr2O7^(2-) ion is treated with an alka...

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  2. Name the third and fourth transition elements of first transition seri...

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  3. What is the theoretical magnetic moment of Ti^(3+) ion ?

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  4. Which of the two Zn(+2) or V(+4) is diamagnetic ?

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  5. Which out of the following ions would form coloured complexes : Ni^(2+...

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  6. How many unpaired electrons are present in each of the following ? Fe^...

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  7. Out of V^(2+) and V^(3+) which is more paramagnetic and why ?

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  8. Calculate the magnetic moment of Fe^(2+) ion (Z = 26).

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  9. Name and write electronic configuration first three elements of second...

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  10. Why Zn^(2+) salts are colourless and Ni2+ salts are coloured?

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  11. A compound has been found to have magnetic moment of 3.9 B.M. How many...

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  12. Name the catalyst of Vanadium used for oxidation of SO2 to SO3 in cont...

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  13. Give reason, Mn^(2+) ion is more paramagnetic than Fe^(2+) ion.

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  14. Express 1312 in roman numbers.

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  15. Express 1313 in roman numbers.

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  16. Express 1315 in roman numbers.

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  17. Express 1320 in roman numbers.

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  18. One day is equal to ............... seconds.

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  19. Write ionic equation showing KMnO4 acting as an oxidising agent in aci...

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  20. The oxidation state of chromium in dichromate ion (Cr2O7^(2-)) and chr...

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  21. What is the oxidation state of Mn is manganate ion.

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