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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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**Step-by-Step Solution:** 1. **Understanding Potassium Dichromate (K₂Cr₂O₇):** - Potassium dichromate is a strong oxidizing agent commonly used in various chemical reactions. It has a characteristic orange color in its solution. 2. **Effect of pH on K₂Cr₂O₇:** - The color of potassium dichromate solution is influenced by the pH of the solution. The pH scale indicates whether a solution is acidic (pH < 7), neutral (pH = 7), or basic (pH > 7). ...
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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.

Knowledge Check

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

    A
    Red
    B
    Black
    C
    Orange
    D
    Green
    • ICSE-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. What is the electronic cofiguration of charomium atom (z= 24) Give re...

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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. (a) Complete the following chemical equations : (i) MnO(4)^(-) (aq) ...

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    19. Assign reasons for the following : (i) Copper (I) ion is not known i...

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    20. Why is Cr^(2+) reducing and Mn^(3+) oxidising when both have d^(4) con...

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