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What is the effect of increasing pH on K...

What is the effect of increasing pH on `K_2Cr_2O_7` solution?

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On increasing pH, orange colour of `K_2Cr_2O_7` solution changes to yellow due to the following reaction :
`Cr_2O_7^(2-) + 2OH^(-) rarr 2CrO_(4)^(2-) + H_(2)O`
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KALYANI PUBLICATION-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. In the transition series, with an increase in atomic number, the atomi...

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  2. Name a lanthanoid element which exhibits +4 oxidation state besides +3...

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  3. What is the effect of increasing pH on K2Cr2O7 solution?

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  4. Which is more basic La(OH)(3)zor Lu(OH)3 ? Why?

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  5. What is the basic difference between the electronic configurations of ...

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  6. Why do transition elements show similarities along the horizontal peri...

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  7. Why the third ionization energy of manganese (atomic number 25) unexpe...

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  8. Which property of the transition elements makes them good catalysts?

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  9. What are coinage metals ?

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  10. Write the ionic reaction for the reaction between MnO4^(-) ions and ox...

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  11. Write one reaction using alkaline KmnO4.

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

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  13. Write the electronic configuration of Cr atom [Z=24].

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  14. Why are Cd^(2+) salts white ?

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  15. Though a transition element, scandium (Z = 21) does not exhibit variab...

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  16. Account for the following: There are irregularities in the electron...

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  17. The gradual decrease in size (actionoid contraction) is from element t...

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  18. La^(3+)(Z=57) and Lu^(3+)(Z=71) do not show any colour in solutions.

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  19. Assign reason for the following Copper (i) ion is not known in aqueo...

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  20. Cr^(2+) is a strong reducing agent whereas Mn^(3+) with the same d^4 c...

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