Home
Class 12
CHEMISTRY
Methylene blue , from its aqueous soluti...

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

A

The adsorption required activation at `25^(@)C`

B

The adsorption is accompanied by a decreases in enthalpy

C

The adsorption increases with increase of temperature

D

The adsorption is irreversible

Text Solution

Verified by Experts

The correct Answer is:
B
As the adsorption of methylene blue over activated characoal is physisorption (Reference: NCERT), it is accompanied by decrease in enthalpy.
Promotional Banner

Similar Questions

Explore conceptually related problems

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25^(@)C . Identify correct one (a)The adsorption requires activation at 25^(@)C (b)The adsorption is accompanied by a decrease in enthalpy (c)The adsorption increases with increases of temperature (d)The adsorption is irreversible

Benzene and naphthalene from an ideal solution at room temperature. For this process, the true statement(s) is(are)

H_(2) can displace the metal from its aqueous solution.

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

One liter aqueous solutions contains 2 xx 10^(-2) kg glucose at 25^@C . Calculate the osmotic pressure of the solution.

On mixing aqueous solution of copper sulphate with aqueous solution of ammonia a deep blue coloured solution is obtained. Choose the correct options :

The process of separation of an organic compound from its aqueous solution by shaking with a suitable solvent in termed solvent extraction or differential extraction. The organic compound present in the aqueous layer moves to the organic solvent because

Given below is a representation of a very important process in the construction of a biomolecule . Choose the correct statement about this process from the following.