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What happens when H(2)O(2) is shaken wit...

What happens when `H_(2)O_(2)` is shaken with acidified `K_(2)Cr_(2)O_(7)` solution ?

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The colour of the solution changes from orange to blue.
`Cr_(2)O_(7)^(2-)+4H_(2)O+2H^(+) to underset("Blue")(2CrO_(5))+5H_(2)O`
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DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
  1. Why is third ionisation enthalpy of manganese exceptionally high ?

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  2. Why are all salts of scandium white ?

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  3. What happens when H(2)O(2) is shaken with acidified K(2)Cr(2)O(7) solu...

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  4. H(2)S gas is passed through an acidic solution of K(2)Cr(2)O(7) . The ...

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  5. How is chemical volcano formed ?

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  6. Transition metals tend to be unreactive with increasing atomic numbers...

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  7. Complete the following reactions : (i) Cr(2)O(7)^(2-)+Sn^(2+)+H^(+) ...

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  8. Explain why Zn^(2+) salts are colourless while Ni^(2+) salts are colou...

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  9. The colour of K(2)Cr(2)O(7) solution changes with the change in pH of ...

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

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  11. Write the electronic configuration of the element with atomic number 1...

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  12. Which out of the two ,La(OH)(3) and Lu(OH)(3), is more basic and why?

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  13. Why are Zn, Cd and Hg quite soft and have low melting points ?

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  14. Lanthanoid contraction is caused due to:

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  15. What may the possible oxidation state of transition metals with the fo...

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  16. Discuss the relative stability in aqueous solution of +2 oxidation sta...

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  17. How many unpaired electrons are present in Mn^(2+) ion ? How do they i...

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  18. Complete the following chemical equations for reactions in aqueous sol...

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  19. There is a greater range of variable oxidation states among the actino...

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  20. Why is ghere a general increase in density of elements from titanaium ...

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