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Why is that an orange solution of K2Cr2O...

Why is that an orange solution of `K_2Cr_2O_7` turns yellow on adding NaOH to it?

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ASSAM ACADEMIC CENTRE-The d and f-block elements-Example
  1. Which compound of thorium is used in making incandescent gas lamp mant...

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  2. Give reason: among transition metals, the highest oxidation state is e...

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  3. Why is that an orange solution of K2Cr2O7 turns yellow on adding NaOH ...

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  4. Name a transition metal which does not exhibit variation in oxidation ...

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  5. Write all possible oxidation states of an element having atomic number...

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  6. Write electronic configuration of Cr(24)

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  7. Zn^(2+) salts are colourless while Cu^(2+) salts are coloured. Give re...

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  8. How would you account for the following? Zn, Cd and Hg are normally no...

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  9. Why do transition elements show variable oxidation state?

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  10. Write formula of a compound where the transition metal is in +7 oxidat...

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  11. On what ground can you say that scandium (Z = 21) is a transition elem...

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  12. Explain why E^@ for Mn^(3+)||Mn^(2+) couple is more positive than that...

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  13. Among the ionic species, Sc^(3+), Ce^(4+) and Eu^(2+), which one is a ...

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  14. Why Sm^(2+), Eu^(2+) and Yb^(2+) ions in solutions are good reducing a...

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  15. In the transition series with an increase in atomic number the atomic ...

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  16. Among the lanthanoids, Ce(III) can be easily oxidised to Ce(IV) (Atomi...

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  17. Why is third ionisation enthalpy of manganese exceptionally high?

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  18. Why are all salts of scandium white?

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  19. Why is +2 oxidation state of manganese quite stable while the same is ...

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  20. Name a transition element which does not exhibit variable oxidation st...

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