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 - Chemistry

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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 [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


Differentiate between adsorbtion and absorption.


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


Discuss the effect of temperature on the adsorption of gases on solids.


Write one similarity between Physisorption and Chemisorption


Physisorption is reversible while chemisorption is irreversible. Why ?


Answer in one sentence:

Name type of adsorption in which the compound is formed.


Which of the following is an example of physisorption?


Which among the following is a property of physisorption?


In physisorption, adsorption is generally ____________.


Extent of physisorption of a gas increases with ______.


Which of the following is not a favourable condition for physical adsorption?


Physical adsorption of a gaseous species may change to chemical adsorption with ______.


In which of the following reactions heterogenous catalysis is involved?

(a) \[\ce{2SO2 (g) + O2 (g) ->[NO(g)] 2SO3 (g)}\]

(b) \[\ce{2SO2 (g) ->[Pt(s)] 2SO3 (g)}\]

(c) \[\ce{N2 (g) + 3H2 (g) ->[Fe(s)] 2NH3 (g)}\]

(d) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]


Why do physisorption and chemisorption behave differently with rise in temperature?


What is the role of activated charcoal in gas mask used in coal mines?


Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.


Which of the following statements is incorrect regarding physisorptions?


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