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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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In aqueous solution, we have

When `pHlt4` (acidic medium) it exists as `Cr_2O_7^(2-)` and colour is orange When `pHgt7` (Basic medium), it exists as `CrO_4^(2-)` and colour is yellow.
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5.1 g sample of H_2O_2 solution containg x%H_2O_2 by weight requires x " mL of " K_2Cr_2O_7 solution for complete oxidation under acidic condition. What is the molarity of K_2Cr_2O_7 solution?

Alcohol level in blood is determined by the reaction with K_2Cr_2O_7 solution in acidic medium. Calculate the blood level in mass percent if 10 " mL of " 0.05 M solution of K_2Cr_2O_7 is required for the reaction of a 10.0 g sample of blood.

State any four uses of K_2Cr_2O_7 .

Explain: (a). Why is K-2Cr_2O_7 generally preferred to Na_2Cr_2O_7 in volumetric analysis? (b). Which divalent metal ion has maximum paramagnetic character amont the first transition metals? Why? (c). How the colour of K_2Cr_2O_7 solution does depend on pH of the solution?

20mL of H_2O_2 is reacted completely with acidified K_2Cr_2O_7 solution. 40mL of K_2Cr_2O_7 solution is required to oxidise the H_2O_2 completely. Also, 2.0mL of the same K_2Cr_2O_7 solution is required to oxidise 5.0mL of a 1.0MH_2C_2O_4 solution to reach equivalence point. Which of the following statements is // are correct?

10 mL solution of H_(2)SO_(4) and H_(2)C_(2)O_(4) (oxalic acid), on titration with with 0.1 M KOH, required 20 " mL of " the base. 10 " mL of " the same solution on titration with (M)/(300)K_(2)Cr_(2)O_(7) required 50 " mL of " K_(2)Cr_(2)O_(7) . Q. What should be the volume strength of H_(2)Cr_(2)O_(7) , if H_(2)O_(2) react with the same volume of (M)/(300)K_(2)Cr_(2)O_(7) solution.

When SO_2 gas is passed through acidified K_2Cr_2O_7 solution, the colour of the solution changes to

Ratio of moles of Fe (II) oxidised by equal volumes of equimolar KMnO_4 and K_2Cr_2O_7 solutions in acidic medium will be :

In a reaction, Cr_(2)O_(7)^(2-) is reduced to Cr^(3+) . What is concentration of 0.1M K_(2)Cr_(2)O_(7) in equivalent per litre? Cr_(2)O_(7)^(2-)+14H^(+)+6erarr2Cr^(3+)+7H_(2)O

A solution of K_2Cr_2O_7 containing 4.9gL^(-1) is used to titrate H_2O_2 solution containing 3.4gL^(-1) in acidic medium. What volume of K_2Cr_2O_7 will be required to react with 20 " mL of " H_2O_2 solution? Also calculate the strength of H_2O_2 in terms of available oxygen.

CENGAGE CHEMISTRY ENGLISH-APPENDIX INORGANIC VOLUME 2-Short Answer Type
  1. Name one ore each of manganese and chromium.

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  2. In the transition series, with an increase in atomic number, the atomi...

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

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

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

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  6. Out of Al, Zn, Mg and Fe which is the densest element?

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

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  8. Explain why transition elements have many irregularities in their elec...

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  9. Explain the following : The paramagnetic character in 3d-transition ...

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  10. Scandium forms no coloured ions, yet it is regarded as a transition el...

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  11. Assertion : Hydrochloric acid is not used to acidify a KMnO(4) solutio...

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  12. Why Sm^(2+) , Eu^(2+) and Yb^(2+) ions are good reducing agents , but ...

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  13. Why is the separation of lanthanide elements difficult?

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  14. Account for the fact that second ionization energies of both Cr and Cu...

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  15. Name the compound used for measuring the hardness of water, i.e., for ...

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  16. How will you distinguish between the following isomer pairs? (i). [...

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  17. The magnitude of stability constant gives an indication of the stabili...

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  18. What are the most important coordination numbers encountered in coordi...

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  19. Name the central atom present in haemoglobin and chlorophyll.

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  20. the red coloured Wilkinson's catalyst, [RhCl(PPh(3))(3)] is a homogeno...

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