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Which of the following is not a physical change?
- a)Boiling of water to give water vapour
- b)Melting of ice to give water
- c)Dissolution of salt in water
- d)Combustion of Liquefied Petroleum Gas (LPG)
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Which of the following is not a physical change?a) Boiling of water t...
A physical change involves only change in physical state whereas a chemical change results in the formation of new substances. Boiling of water, melting of ice and dissolution of salt are physical changes as no new products are formed.
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Which of the following is not a physical change?a) Boiling of water t...
Physical Changes
Physical changes are changes in which the substance undergoes a change in its physical state or appearance, but its chemical composition remains the same. These changes can be reversible, and the substance can be changed back to its original form.
Explanation
The combustion of Liquefied Petroleum Gas (LPG) is not a physical change, but a chemical change. Let's understand why:
Physical Changes:
1. Boiling of water to give water vapor: When water is heated, it reaches its boiling point and undergoes a physical change, transforming into water vapor. This change is reversible, as the water vapor can be condensed back into liquid water by cooling.
2. Melting of ice to give water: When ice is heated, it melts and transforms into liquid water. This is also a physical change and is reversible, as the liquid water can be frozen back into ice by cooling.
3. Dissolution of salt in water: When salt is added to water, it dissolves and forms a solution. This is a physical change, as the salt molecules are dispersed evenly throughout the water, but the chemical composition of both salt and water remains the same.
Chemical Change:
4. Combustion of Liquefied Petroleum Gas (LPG): Combustion is a chemical change. When LPG is burned, it reacts with oxygen in the air to produce carbon dioxide, water vapor, and heat. The chemical composition of LPG changes during combustion, and new substances are formed. This change is irreversible, as it is not possible to convert the products of combustion back into LPG.
Therefore, the correct answer is option 'D' - Combustion of Liquefied Petroleum Gas (LPG).
Physical changes are changes in which the substance undergoes a change in its physical state or appearance, but its chemical composition remains the same. These changes can be reversible, and the substance can be changed back to its original form.
Explanation
The combustion of Liquefied Petroleum Gas (LPG) is not a physical change, but a chemical change. Let's understand why:
Physical Changes:
1. Boiling of water to give water vapor: When water is heated, it reaches its boiling point and undergoes a physical change, transforming into water vapor. This change is reversible, as the water vapor can be condensed back into liquid water by cooling.
2. Melting of ice to give water: When ice is heated, it melts and transforms into liquid water. This is also a physical change and is reversible, as the liquid water can be frozen back into ice by cooling.
3. Dissolution of salt in water: When salt is added to water, it dissolves and forms a solution. This is a physical change, as the salt molecules are dispersed evenly throughout the water, but the chemical composition of both salt and water remains the same.
Chemical Change:
4. Combustion of Liquefied Petroleum Gas (LPG): Combustion is a chemical change. When LPG is burned, it reacts with oxygen in the air to produce carbon dioxide, water vapor, and heat. The chemical composition of LPG changes during combustion, and new substances are formed. This change is irreversible, as it is not possible to convert the products of combustion back into LPG.
Therefore, the correct answer is option 'D' - Combustion of Liquefied Petroleum Gas (LPG).
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Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer?.
Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer? for UPSC 2025 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not a physical change?a) Boiling of water to give water vapourb) Melting of ice to give waterc) Dissolution of salt in waterd) Combustion of Liquefied Petroleum Gas (LPG)Correct answer is option 'D'. Can you explain this answer?.
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