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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?
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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...
Explanation:
The correct answer is option 'D', which states that the combustion of Liquefied Petroleum Gas (LPG) is not a physical change. Here's the explanation:
Physical Changes:
Physical changes are changes in the state or form of matter without any change in its chemical composition. In physical changes, the substance involved retains its chemical identity. Some examples of physical changes include changes in state (such as boiling or melting), dissolution, and phase transitions.
Boiling of water to give water vapor:
When water is heated to its boiling point, it undergoes a physical change and changes from a liquid state to a gaseous state. The chemical composition of water remains the same, only its physical state changes.
Melting of ice to give water:
When ice is heated, it melts and changes from a solid state to a liquid state. Again, the chemical composition of ice remains the same, only its physical state changes.
Dissolution of salt in water:
When salt is added to water, it dissolves and forms a homogenous solution. This is also a physical change as the salt molecules disperse in the water molecules, but the chemical composition of salt remains the same.
Combustion of Liquefied Petroleum Gas (LPG):
Combustion is a chemical change rather than a physical change. When Liquefied Petroleum Gas (LPG) undergoes combustion, 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. Therefore, combustion is a chemical change.
In conclusion, the combustion of Liquefied Petroleum Gas (LPG) is not a physical change but a chemical change. The other options mentioned (boiling of water, melting of ice, and dissolution of salt in water) are examples of physical changes.
The correct answer is option 'D', which states that the combustion of Liquefied Petroleum Gas (LPG) is not a physical change. Here's the explanation:
Physical Changes:
Physical changes are changes in the state or form of matter without any change in its chemical composition. In physical changes, the substance involved retains its chemical identity. Some examples of physical changes include changes in state (such as boiling or melting), dissolution, and phase transitions.
Boiling of water to give water vapor:
When water is heated to its boiling point, it undergoes a physical change and changes from a liquid state to a gaseous state. The chemical composition of water remains the same, only its physical state changes.
Melting of ice to give water:
When ice is heated, it melts and changes from a solid state to a liquid state. Again, the chemical composition of ice remains the same, only its physical state changes.
Dissolution of salt in water:
When salt is added to water, it dissolves and forms a homogenous solution. This is also a physical change as the salt molecules disperse in the water molecules, but the chemical composition of salt remains the same.
Combustion of Liquefied Petroleum Gas (LPG):
Combustion is a chemical change rather than a physical change. When Liquefied Petroleum Gas (LPG) undergoes combustion, 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. Therefore, combustion is a chemical change.
In conclusion, the combustion of Liquefied Petroleum Gas (LPG) is not a physical change but a chemical change. The other options mentioned (boiling of water, melting of ice, and dissolution of salt in water) are examples of physical changes.
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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?
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