Class 9 Exam > Class 9 Questions > Which among the following show positive devia...
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Which among the following show positive deviation?
- a)Hydrochloric acid and water
- b)Chloroform and benzene
- c)Acetone and carbon disulphide
- d)Acetone and aniline
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Which among the following show positive deviation?a)Hydrochloric acid ...
( Solute- solute and > solute – solvent interactions Solvent – solvent )
Most Upvoted Answer
Which among the following show positive deviation?a)Hydrochloric acid ...
Positive Deviation in Solutions
Positive deviation is observed when the actual vapour pressure of a solution is greater than the expected vapour pressure. It occurs when the intermolecular forces between the solute and the solvent are weaker than the intermolecular forces between the solute-solute and solvent-solvent molecules. This results in the molecules escaping from the surface more easily, leading to an increased vapour pressure.
Examples of Positive Deviation
Out of the given options, option C (Acetone and carbon disulphide) shows positive deviation. The other options exhibit negative deviation.
Explanation
Acetone and carbon disulphide have similar molecular structures with similar intermolecular forces. However, they have different polarities. Acetone is a polar molecule due to the presence of a carbonyl group, while carbon disulphide is a non-polar molecule. When mixed together, the polar and non-polar molecules do not interact strongly with each other, resulting in a positive deviation from Raoult's law.
Implications
Positive deviation is important in the manufacture of certain products such as perfumes, where the volatility of the components is important. It is also used in the separation of different components in the chemical industry.
Positive deviation is observed when the actual vapour pressure of a solution is greater than the expected vapour pressure. It occurs when the intermolecular forces between the solute and the solvent are weaker than the intermolecular forces between the solute-solute and solvent-solvent molecules. This results in the molecules escaping from the surface more easily, leading to an increased vapour pressure.
Examples of Positive Deviation
Out of the given options, option C (Acetone and carbon disulphide) shows positive deviation. The other options exhibit negative deviation.
Explanation
Acetone and carbon disulphide have similar molecular structures with similar intermolecular forces. However, they have different polarities. Acetone is a polar molecule due to the presence of a carbonyl group, while carbon disulphide is a non-polar molecule. When mixed together, the polar and non-polar molecules do not interact strongly with each other, resulting in a positive deviation from Raoult's law.
Implications
Positive deviation is important in the manufacture of certain products such as perfumes, where the volatility of the components is important. It is also used in the separation of different components in the chemical industry.
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Which among the following show positive deviation?a)Hydrochloric acid ...
C
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Which among the following show positive deviation?a)Hydrochloric acid and waterb)Chloroform and benzenec)Acetone and carbon disulphided)Acetone and anilineCorrect answer is option 'C'. Can you explain this answer?
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