Home
Class 12
CHEMISTRY
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.

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • SURFACE CHEMISTRY

    MODERN PUBLICATION|Exercise EXERCISE|411 Videos

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise EXERCISE|102 Videos

Similar Questions

Explore conceptually related problems

H_(2) A is a weak diprotic acid. If the pH of 0.1 M H_(2)A solution is 3 and concentration of A^(2-) is 10^(-12) at 25^(@)C. Select correct statement (s)

Statement-1(Assertion) and Statement-2 (reason) Each of these question also has four alternative choices, only one of which is the correct answer. You have to select the correct choice as given below. (a) Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1 Statement-1 is true, Statement-2 is true, Statement-2 is not a correct explanation for Statement -1 (c) Statement -1 is true, Statement -2 is false (d) Statement -1 is false, Statement -2 is true Statement -1 The equation (logx)^2+logx^2-3=0 has two distinct solutions. Statement-2 logx^(2) =2logx.

Statement-1(Assertion) and Statement-2 (reason) Each of these question also has four alternative choices, only one of which is the correct answer. You have to select the correct choice as given below. (a) Statement-1 is true, Statement-2 is true, Statement-2 is a correct explanation for Statement-1 Statement-1 is true, Statement-2 is true, Statement-2 is not a correct explanation for Statement -1 (c) Statement -1 is true, Statement -2 is false (d) Statement -1 is false, Statement -2 is true Statement -1 log_x3.log_(x//9)3=log_81(3) has a solution. Statement-2 Change of base in logarithms is possible .

When electricity is passed through an aqueous solution of sodium chloride, three products are obtained. Why is it’s the process called chlor alkali?

Calculate the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25.

each question constain STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: When SnO_(2) is reacted with NaOH , then its sol particles are attracted towards cathode. STATEMENT-2: When SnO_(2) is reacted with NaOH, then it gives SnO_(3)^(2-) which is adsorbed by SnO_(2) , so it is negatively charged sol. if both the statement are TRUE and STATEMENT -2 is the correct explanation of STATEMENT - 1 , If both the statement TRUE are STATEMENT -2 is NOT the correct explanation of STATEMENT -1 , If STATEMENT -1 is TRUE and STATEMENT - 2 is FALSE , If STATEMENT -1 is FALSE and STATEMENT -2 is TRUE.

STATEMENT-1: If SOP of substance is less than -1.23 V and over voltage=0V, then its oxidation in its aqueous solution is not possible at 298 K. , STATEMENT-2: Standard reduction potential (SRP) of water is +1.23V.

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant, uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statements(s) from the following

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Copper wires are used as the connecting wires in an electical circuit, as its resisitvity is low and condutivity is high. Reason: Copper can be easily drawn into wires

select the correct statement (s): physisorption is favored by low temperature chemisorption is favored by very high temperature because the process is endothermic chemisorption increase with increases in temperature owing to high activation energy, Oxygen adsorbed by charcoal can be desorbed by lowing pressure and temperature.

MODERN PUBLICATION-SURFACE CHEMISTRY-EXERCISE
  1. Fill the blanks with appropriate answer- Fish plates in the railways t...

    Text Solution

    |

  2. Fill in the blanks- is used for welding filling of cracked metallic b...

    Text Solution

    |

  3. Methylene blue, from its aqueous solution, is adsorbed on activated ch...

    Text Solution

    |

  4. Fill in the blanks- alloy is used to make electric heaters.

    Text Solution

    |

  5. Fill in the blanks- Coin metal is used in the making of and .

    Text Solution

    |

  6. Give reason for the following statement- Nichrome is an alloy.

    Text Solution

    |

  7. Fill in the blanks- Magnelium alloy is used in the making of and

    Text Solution

    |

  8. Which of the following is/are not true in Freundlich adsorption isothe...

    Text Solution

    |

  9. Fill in the blanks- Aquaregia is a mixture of and.

    Text Solution

    |

  10. The correct statement(s) pertaining to the adsorption of a gas on a so...

    Text Solution

    |

  11. The mixture of one parts of concentrated nitric acid and three parts o...

    Text Solution

    |

  12. The given graphs/data I, II, III and IV represent general trends obser...

    Text Solution

    |

  13. When O2 is adsorbed on a metallic surface, electron transfer occurs fr...

    Text Solution

    |

  14. The size of colloidal particles is

    Text Solution

    |

  15. Which mixture is used to dissolve precious metal gold?

    Text Solution

    |

  16. Fill in the blanks with appropriate answer- Mixture of conc. nitric ac...

    Text Solution

    |

  17. State whether the statement is true or false- Mixture of concentrated ...

    Text Solution

    |

  18. Explain the following terms-Aquaregia.

    Text Solution

    |

  19. Fill in the blanks- Gold metal can be dissolved only in .

    Text Solution

    |

  20. Fill in the blanks- Good quality electric wires are made up of alloy.

    Text Solution

    |