A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
No, this change cannot be reversed because cement makes a hard product after mixing with water or when it comes in contact of moisture. This change cannot be reversed because it is due to chemical reaction.
Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.
| S.No. | Change | Can be reversed (Yes/ No) |
|---|---|---|
| 1 | The sawing of a piece of wood | |
| 2 | The melting of ice candy | |
| 3 | Dissolving sugar in water | |
| 4 | The cooking of food | |
| 5 | The ripening of a mango | |
| 6 | Souring of milk |
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
No, this change cannot be reversed because cement makes a hard product after mixing with water or when it comes in contact of moisture. This change cannot be reversed because it is due to chemical reaction....
Step-by-step explanation:
• No, this change cannot be reversed because cement makes a hard product after mixing with water or when it comes in contact of moisture
• This change cannot be reversed because it is due to chemical reaction
•
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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