मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Assertion: Detergents with low CMC are more economical to use. Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents become

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प्रश्न

Assertion: Detergents with low CMC are more economical to use.

Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

पर्याय

  • Assertion and reason both are correct and the reason is correct explanation of assertion.

  • Assertion and reason both are correct but reason does not explain assertion.

  • Assertion is correct but reason is incorrect.

  • Both assertion and reason are incorrect.

  • Assertion is incorrect but reason is correct.

MCQ
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उत्तर

Assertion and reason both are correct and the reason is correct explanation of assertion.

Explanation:

Detergents with low CMC are more economical to use as they involve formation of micelle which is used for cleaning of oil and dirt from our cloth. Micelle formation takes place when the concentration of the detergent becomes equal to the CMC.

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पाठ 5: Surface Chemistry - Exercises [पृष्ठ ७३]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 5 Surface Chemistry
Exercises | Q 77 | पृष्ठ ७३

संबंधित प्रश्‍न

Write the differences between physisorption and chemisorption with respect to the following: 

(i) Specificity

(ii) Temperature dependence

(iii) Reversibility and

(iv) Enthalpy change


Give reasons for the following observations:

Physisorption decreases with increase in temperature.


Why are powdered substances more effective adsorbents than their crystalline forms?


Distinguish between the meaning of the terms adsorption and absorption. Give one example of.


What are the factors which influence the adsorption of a gas on a solid?


Physisorption is reversible while chemisorption is irreversible. Why ?


How does chemisorption vary with temperature?


Answer in one sentence:

Name type of adsorption in which vander Waals focres are present.


Answer in one sentence:

Name type of adsorption in which the compound is formed.


Which of the following compounds is formed when tungsten adsorbs oxygen gas?


Which among the following is true for chemisorption?


In physisorption, adsorption is generally ____________.


Why is it important to have clean surface in surface studies?


Why is chemisorption referred to as activated adsorption?


What is the role of diffusion in heterogenous catalysis?


Rate of physisorption increase with:-


Write three differences between physisorption and chemisorption.


Assertion A : Activated charcoal adsorbs SO2 more efficiently than CH4.

Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal.
In light of the above statements, choose the correct answer from the options given below.


Which of the following statements is not true about physisorption?


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