हिंदी

Assertion (A): A liquid crystallises into a solid and is accompanied by decrease in entropy. Reason (R): In crystals, molecules organise in an ordered manner. - Chemistry

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प्रश्न

Assertion (A): A liquid crystallises into a solid and is accompanied by decrease in entropy.

Reason (R): In crystals, molecules organise in an ordered manner.

विकल्प

  • Both A and R are true and R is the correct explanation of A.

  • Both A and R are true but R is not the correct explanation of A.

  • A is true but R is false.

  • A is false but R is true.

MCQ

उत्तर

Both A and R are true and R is the correct explanation of A.

Explanation:

The entropy of a liquid reduces as it crystallises. Because the molecules are more organised in crystalline form.

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Spontaneity - Entropy and Spontaneity
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Thermodynamics - Multiple Choice Questions (Type - I) [पृष्ठ ७७]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 11
अध्याय 6 Thermodynamics
Multiple Choice Questions (Type - I) | Q 57 | पृष्ठ ७७

संबंधित प्रश्न

A reaction, A + B → C + D + q is found to have a positive entropy change. The reaction will be ______.


For the reaction, \[\ce{2Cl_{(g)} → Cl_{2(g)}}\], what are the signs of ΔH and ΔS?


The entropy change can be calculated by using the expression ∆S = `q_(rev)/T`. When water freezes in a glass beaker, choose the correct statement amongst the following :


The spontaneity means, having the potential to proceed without the assistance of external agency. The processes which occur spontaneously are:

(i) Flow of heat from colder to warmer body.

(ii) Gas in a container contracting into one corner.

(iii) Gas expanding to fill the available volume.

(iv) Burning carbon in oxygen to give carbon dioxide.


Enthalpy diagram for a particular reaction is given in figure. Is it possible to decide spontaneity of a reaction from given diagram. Explain.


Match the following processes with entropy change:

Reaction Entropy change
(i) A liquid vapourises (a) ∆S = 0
(ii) Reaction is non-spontaneous
at all temperatures and ∆H
is positive
(b) ∆S = positive
(iii) Reversible expansion of an ideal gas (c) ∆S = negative

For a sample of perfect gas when its pressure is changed isothermally from Pi to Pf, the entropy change is given by ______.


For the irreversible expansion of an ideal gas under isothermal conditions, the correct option is ______.


The process with negative entropy change is ______.


A reaction at 1 bar is non-spontaneous at low temperatures but becomes spontaneous at high temperatures. Identify the correct statement about the reaction among the following.


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