Defence Exam > Defence Questions > Which of the following substances cause tempo...
Start Learning for Free
Which of the following substances cause temporary hardness in water?
1. Mg (HC03)2
2. Ca (HC03)2
3. CaCl2
4. MgS04
1. Mg (HC03)2
2. Ca (HC03)2
3. CaCl2
4. MgS04
Select the correct answer using the code given below.
- a)3 and 4
- b)2 and 3
- c)1 and 4
- d)1 and 2
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Which of the following substances cause temporary hardness in water?1....
- Mg (HCO3)2 Magnesium Hydrogen Carbonate and Ca (HCO3)2 Calcium bicarbonate cause temporary hardness in water.
- Hard water is water that contains cations with a charge of +2, especially Ca2+ and Mg2+ Hence, both the salts mentioned above impart hardness to water. Hardness of water can be removed by boiling water, ion exchange process, Calgon process, by adding washing soda etc.
Most Upvoted Answer
Which of the following substances cause temporary hardness in water?1....
Temporary hardness of water is caused by hydrogen carbonates of calcium and magnesium....
Free Test
FREE
| Start Free Test |
Community Answer
Which of the following substances cause temporary hardness in water?1....
Understanding Temporary Hardness in Water
Temporary hardness in water is primarily caused by the presence of bicarbonate salts, which can be removed by boiling the water. The substances listed in the question can be analyzed for their hardness contribution.
Key Substances and Their Effects
- Mg(HCO3)2 (Magnesium Bicarbonate)
This compound contributes to temporary hardness because it releases magnesium ions and bicarbonate ions when dissolved in water. Upon boiling, it precipitates as magnesium carbonate, thus removing hardness.
- Ca(HCO3)2 (Calcium Bicarbonate)
Similar to magnesium bicarbonate, calcium bicarbonate also causes temporary hardness. It dissociates into calcium ions and bicarbonate ions in water, and boiling leads to the formation of calcium carbonate, which can precipitate out of solution, thus removing the hardness.
- CaCl2 (Calcium Chloride)
Calcium chloride does not cause temporary hardness as it is a soluble salt that does not contain bicarbonate. It contributes to permanent hardness because it remains in solution even after boiling.
- MgSO4 (Magnesium Sulfate)
Like calcium chloride, magnesium sulfate contributes to permanent hardness. Its soluble nature means that boiling will not remove the hardness as it does not contain bicarbonate ions.
Conclusion
Based on the analysis, only Mg(HCO3)2 and Ca(HCO3)2 cause temporary hardness in water. Therefore, the correct answer is option 'D', which includes substances 1 and 2.
Temporary hardness in water is primarily caused by the presence of bicarbonate salts, which can be removed by boiling the water. The substances listed in the question can be analyzed for their hardness contribution.
Key Substances and Their Effects
- Mg(HCO3)2 (Magnesium Bicarbonate)
This compound contributes to temporary hardness because it releases magnesium ions and bicarbonate ions when dissolved in water. Upon boiling, it precipitates as magnesium carbonate, thus removing hardness.
- Ca(HCO3)2 (Calcium Bicarbonate)
Similar to magnesium bicarbonate, calcium bicarbonate also causes temporary hardness. It dissociates into calcium ions and bicarbonate ions in water, and boiling leads to the formation of calcium carbonate, which can precipitate out of solution, thus removing the hardness.
- CaCl2 (Calcium Chloride)
Calcium chloride does not cause temporary hardness as it is a soluble salt that does not contain bicarbonate. It contributes to permanent hardness because it remains in solution even after boiling.
- MgSO4 (Magnesium Sulfate)
Like calcium chloride, magnesium sulfate contributes to permanent hardness. Its soluble nature means that boiling will not remove the hardness as it does not contain bicarbonate ions.
Conclusion
Based on the analysis, only Mg(HCO3)2 and Ca(HCO3)2 cause temporary hardness in water. Therefore, the correct answer is option 'D', which includes substances 1 and 2.
|
Explore Courses for Defence exam
|
|
Similar Defence Doubts
Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer?
Question Description
Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer?.
Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer?.
Solutions for Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Defence.
Download more important topics, notes, lectures and mock test series for Defence Exam by signing up for free.
Here you can find the meaning of Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer?, a detailed solution for Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which of the following substances cause temporary hardness in water?1. Mg (HC03)22. Ca (HC03)23. CaCl24. MgS04Select the correct answer using the code given below.a)3 and 4b)2 and 3c)1 and 4d)1 and 2Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice Defence tests.
|
|
Explore Courses for Defence exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup