Class 7 Exam > Class 7 Questions > Which of the following statements is correct?...
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Which of the following statements is correct?
- a)Evaporation is a chemical change
- b)Digestion of food is a chemical change
- c)Burning of paper is a physical change
- d)All of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following statements is correct?a)Evaporation is a chemic...
Digestion of food is a chemical change
This question is part of UPSC exam. View all Class 7 courses
Most Upvoted Answer
Which of the following statements is correct?a)Evaporation is a chemic...
Because digestion is a chemical change. We don't get food after digestion
Community Answer
Which of the following statements is correct?a)Evaporation is a chemic...
Introduction:
In this question, we are given four statements and we need to determine which one is correct. The options are:
a) Evaporation is a chemical change
b) Digestion of food is a chemical change
c) Burning of paper is a physical change
d) All of the above
Determining the correct statement:
To determine the correct statement, let's analyze each option one by one.
a) Evaporation is a chemical change:
Evaporation is the process of a liquid turning into a gas, usually due to an increase in temperature. It is a physical change because the substance undergoing evaporation does not change its chemical composition. Only the physical state of the substance changes from liquid to gas. Therefore, option a) is incorrect.
b) Digestion of food is a chemical change:
Digestion is the process by which food is broken down into simpler substances that can be absorbed by the body. It involves both physical and chemical changes. The physical changes include chewing, grinding, and mixing of food with saliva. The chemical changes occur when enzymes in the digestive system break down complex molecules into simpler ones. These chemical changes involve the breaking and formation of chemical bonds. Therefore, option b) is correct.
c) Burning of paper is a physical change:
Burning is a chemical reaction that involves the combustion of a substance. When paper burns, it undergoes a chemical change. The cellulose fibers in paper combine with oxygen in the air, resulting in the release of heat, light, carbon dioxide, and water vapor. Therefore, option c) is incorrect.
d) All of the above:
Since only option b) is correct, the statement "All of the above" is incorrect.
Conclusion:
After analyzing each option, we can conclude that the correct statement is option b) "Digestion of food is a chemical change."
In this question, we are given four statements and we need to determine which one is correct. The options are:
a) Evaporation is a chemical change
b) Digestion of food is a chemical change
c) Burning of paper is a physical change
d) All of the above
Determining the correct statement:
To determine the correct statement, let's analyze each option one by one.
a) Evaporation is a chemical change:
Evaporation is the process of a liquid turning into a gas, usually due to an increase in temperature. It is a physical change because the substance undergoing evaporation does not change its chemical composition. Only the physical state of the substance changes from liquid to gas. Therefore, option a) is incorrect.
b) Digestion of food is a chemical change:
Digestion is the process by which food is broken down into simpler substances that can be absorbed by the body. It involves both physical and chemical changes. The physical changes include chewing, grinding, and mixing of food with saliva. The chemical changes occur when enzymes in the digestive system break down complex molecules into simpler ones. These chemical changes involve the breaking and formation of chemical bonds. Therefore, option b) is correct.
c) Burning of paper is a physical change:
Burning is a chemical reaction that involves the combustion of a substance. When paper burns, it undergoes a chemical change. The cellulose fibers in paper combine with oxygen in the air, resulting in the release of heat, light, carbon dioxide, and water vapor. Therefore, option c) is incorrect.
d) All of the above:
Since only option b) is correct, the statement "All of the above" is incorrect.
Conclusion:
After analyzing each option, we can conclude that the correct statement is option b) "Digestion of food is a chemical change."
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Which of the following statements is correct?a)Evaporation is a chemical changeb)Digestion of food is a chemical changec)Burning of paper is a physical changed)All of the aboveCorrect answer is option 'B'. Can you explain this answer?
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