Class 5 Exam > Class 5 Questions > Which of the following statements is true?(i)...
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Which of the following statements is true?
(i) Chlorination makes the water safe for drinking
(ii) Chlorinated water is made by distillation
(iii) Water must be boiled for at least 10 minutes to make it fit for drinking
(iv) Potassium paramagnet is also used to kill germs in water
(ii) Chlorinated water is made by distillation
(iii) Water must be boiled for at least 10 minutes to make it fit for drinking
(iv) Potassium paramagnet is also used to kill germs in water
- a)(i), (iii), and (iv)
- b)(i), (ii), and (iii)
- c)(i), (ii), (iii), and (iv)
- d)(ii),(iii), and (iv)
Correct answer is option 'A'. Can you explain this answer?
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Which of the following statements is true?(i) Chlorination makes the w...
Statement Analysis:
(i) Chlorination makes the water safe for drinking
(ii) Chlorinated water is made by distillation
(iii) Water must be boiled for at least 10 minutes to make it fit for drinking
(iv) Potassium permanganate is also used to kill germs in water
Let's analyze each statement one by one:
(i) Chlorination makes the water safe for drinking:
- Chlorination is a commonly used method to disinfect water.
- Chlorine kills harmful bacteria, viruses, and other microorganisms present in the water.
- Thus, chlorination does make the water safe for drinking.
(ii) Chlorinated water is made by distillation:
- Chlorinated water is not made by distillation.
- Distillation is a process of separating different components of a liquid mixture based on their boiling points.
- Chlorination, on the other hand, is a process of adding chlorine to water to kill germs.
- Therefore, statement (ii) is false.
(iii) Water must be boiled for at least 10 minutes to make it fit for drinking:
- Boiling water is an effective method to kill most types of pathogens present in it.
- It is generally recommended to boil water for at least 1 minute to make it safe for drinking.
- However, boiling water for 10 minutes would certainly ensure the elimination of any harmful microorganisms.
- Therefore, statement (iii) is true.
(iv) Potassium permanganate is also used to kill germs in water:
- Potassium permanganate is a strong oxidizing agent and can be used to treat water.
- It can effectively kill certain types of bacteria, viruses, and parasites.
- However, it is not as commonly used as chlorine for water disinfection.
- Therefore, statement (iv) is true.
After analyzing each statement, we can conclude that the correct answer is (A) (i), (iii), and (iv).
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Which of the following statements is true?(i) Chlorination makes the w...
Understanding the Correct Statements
To determine which statements about water safety are true, let’s analyze each one:
Statement (i): Chlorination makes the water safe for drinking
- Chlorination is a widely used method for disinfecting water.
- It effectively kills bacteria, viruses, and other harmful microorganisms, making the water safe for consumption.
- True
Statement (ii): Chlorinated water is made by distillation
- Chlorination and distillation are different processes.
- Distillation involves boiling water and collecting the steam to remove impurities, while chlorination adds chlorine to disinfect.
- False
Statement (iii): Water must be boiled for at least 10 minutes to make it fit for drinking
- Boiling water is a reliable method to kill germs.
- The recommended boiling time can vary, but generally, boiling water for 1-3 minutes is sufficient at sea level.
- However, boiling for 10 minutes ensures safety, especially at higher altitudes.
- True
Statement (iv): Potassium paramagnet is also used to kill germs in water
- Potassium permanganate can be used as a disinfectant and has germicidal properties.
- It helps in purifying water, particularly in treating certain waterborne diseases.
- True
Conclusion
Based on the evaluations:
- Statements (i), (iii), and (iv) are true.
- Statement (ii) is false.
Thus, the correct answer is option 'A': (i), (iii), and (iv).
To determine which statements about water safety are true, let’s analyze each one:
Statement (i): Chlorination makes the water safe for drinking
- Chlorination is a widely used method for disinfecting water.
- It effectively kills bacteria, viruses, and other harmful microorganisms, making the water safe for consumption.
- True
Statement (ii): Chlorinated water is made by distillation
- Chlorination and distillation are different processes.
- Distillation involves boiling water and collecting the steam to remove impurities, while chlorination adds chlorine to disinfect.
- False
Statement (iii): Water must be boiled for at least 10 minutes to make it fit for drinking
- Boiling water is a reliable method to kill germs.
- The recommended boiling time can vary, but generally, boiling water for 1-3 minutes is sufficient at sea level.
- However, boiling for 10 minutes ensures safety, especially at higher altitudes.
- True
Statement (iv): Potassium paramagnet is also used to kill germs in water
- Potassium permanganate can be used as a disinfectant and has germicidal properties.
- It helps in purifying water, particularly in treating certain waterborne diseases.
- True
Conclusion
Based on the evaluations:
- Statements (i), (iii), and (iv) are true.
- Statement (ii) is false.
Thus, the correct answer is option 'A': (i), (iii), and (iv).
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Which of the following statements is true?(i) Chlorination makes the water safe for drinking(ii) Chlorinated water is made by distillation(iii) Water must be boiled for at least 10 minutes to make it fit for drinking(iv) Potassium paramagnet is also used to kill germs in watera)(i), (iii), and (iv)b)(i), (ii), and (iii)c)(i), (ii), (iii), and (iv)d)(ii),(iii), and (iv)Correct answer is option 'A'. Can you explain this answer?
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