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Methylene blue, from its aqueous solutio...

Methylene blue, from its aqueous solution is adsorbed on activated charcoal at `25^(@)C.`For this process, the correct statement is

A

the adsorption requires activation at `25^@C`.

B

the adsorption is accompanied by a decrease in enthalpy.

C

the adsorption increases with increase of temperature.

D

the adsorption is irreversible.

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The adsorption of methylene blue on activated charcoal is physical adsorption. It is accompanied by a decrease in enthalpy.
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p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound X is

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound Y is

p-Amino-N,N-dimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue colouration due to the formation of methylene blue. Treatment of aqueous solution of Y with reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, the treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of Z. Q. Compound Z is

MODERN PUBLICATION-SURFACE CHEMISTRY-COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) (B. MULTIPLE CHOCE QUESTIONS FROM COMPETITIVE EXAMINATIONS)
  1. For a linear plot of log (x/m) versus log p in a Freundlich adsorption...

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  2. Which of the following is not favourable condition for physical adsorp...

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  3. Which of the following process is responsible for the formation of del...

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  4. The Tyndall effect is observed only when following conditions are sati...

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  5. The coagulation power of an electrolyte for As(2) S(3) decreases in th...

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  6. Which of the following electrolytes will have maximum coagulating valu...

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  7. Gold sol is not a

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  8. Which of the following statement is true about the adsorption?

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  9. Which of the following is an example of homogeneous catalysis?

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  10. Critical micelle concentration for a soap solution is 1.5 xx 10^(-4)" ...

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  11. The precipitation power of an electrolyte increases with

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  12. A gas undergoes physical adsorption on a surface and follows the givn ...

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  13. An example solid sol of

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  14. For coagulation of arsenious sulphide sol, which one of the following ...

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  15. Adsorption of a gas follows Freundlich adsorption isotherm. x is the m...

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  16. Among the following, the false statement is :

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  17. Among the following , the surfactant that will form micelles in aqueou...

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  18. Among the electrolytes Na, SO4 , CaCl4 , Al2(SO4)3 and NH4 Cl, the m...

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  19. Methylene blue, from its aqueous solution is adsorbed on activated cha...

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  20. Which one of the following forms micells in aqueous solution above cer...

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