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At pH = 11, Cr2O7 changes to...

At `pH = 11, Cr_2O_7` changes to

A

`CrO_3`

B

`CrO_4^(2-)`

C

`Cr^(3+)`

D

`CrO_4^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
B
Hint : The increased. `OH^(-)` ions combine with `H^(+)` ions and reaction produces more chromate ions.
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ACCURATE PUBLICATION-D & F BLOCK ELEMENTS -2 OR 5 MARKS QUESTIONS
  1. At pH = 11, Cr2O7 changes to

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  2. What are transition elements ? Which of the d block elements are not r...

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  3. What are the characteristics of the transition elements ?

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  4. In what way is the electronic configuration of transition elements dif...

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  5. Why is Copper considered as transition metal ?

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  6. Scandium (z = 21) is a transition element but zinc (z = 30) is not. Ex...

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  7. Sliver atom has completely filled d-orbitals (4d^10) in its ground sta...

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  8. [Ti (H2O)6]^(3+) is coloured while [Sc(H2O)6]^(3+) is colourless. Expl...

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  9. Explain why TiCl3 is coloured but TiCl4 is colourless ?

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  10. Explain why [Ti (H2O)6]^(3+) is violet while [Ti (H2O)6]^(4+) is colou...

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  11. Why Cd^(2+) salts are white ? Cd=48

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  12. Which of the two is paramagnetic V(IV) or V(V) and why ?

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  13. Why does Mn(II) shows maximum paramagnetic character among the dival...

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  14. Name the elements represented by following symbols : Hg , Pb , Au , Ag...

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  15. What is atomicity ? Explain with two examples.

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  16. What is the atomicity of the following : oxygen

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  17. Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic in natur...

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  18. Transition metals have high melting points and boiling points. Why?

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  19. What is the atomicity of the following : ozone

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  20. What is the atomicity of the following : neon

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  21. What is the atomicity of the following : phosphorous

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