Class 11 Exam > Class 11 Questions > Direction: In the following questions, a st...
Start Learning for Free
Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.
Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.
Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.
- a)Statement A and R both are correct and R is the correct explanation of A.
- b)A is correct but R is not correct.
- c)A and R both are correct but R is not the correct explanation of A.
- d)A and R both are false.
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Direction: In the following questions, a statement of Assertion (A) ...
Permanent hardness of water can be removed by using washing soda. Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates.
View all questions of this test
Most Upvoted Answer
Direction: In the following questions, a statement of Assertion (A) ...
**Explanation:**
**Assertion (A):** Permanent hardness of water is removed by treatment with washing soda.
**Reason (R):** Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.
The correct answer is option 'A', which states that both the assertion (A) and the reason (R) are correct, and the reason (R) is the correct explanation of the assertion (A).
**Explanation:**
Permanent hardness of water is caused by the presence of soluble calcium and magnesium salts, primarily calcium sulfate (CaSO4) and magnesium sulfate (MgSO4). These salts do not precipitate when water is boiled, unlike temporary hardness caused by the presence of bicarbonates. Therefore, an alternative method is required to remove permanent hardness.
Washing soda, also known as sodium carbonate (Na2CO3), is commonly used to remove permanent hardness. When washing soda is added to hard water, it reacts with the soluble calcium and magnesium salts to form insoluble carbonates. This reaction can be represented as follows:
CaSO4 + Na2CO3 -> CaCO3 + Na2SO4
MgSO4 + Na2CO3 -> MgCO3 + Na2SO4
The formed calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) are insoluble and can be easily removed by precipitation or filtration. The remaining sodium sulfate (Na2SO4) remains in solution and does not contribute to water hardness.
Therefore, washing soda effectively removes permanent hardness by converting the soluble calcium and magnesium salts into insoluble carbonates. This process is known as precipitation or chemical softening.
Hence, both the assertion (A) and the reason (R) are correct, and the reason (R) provides the correct explanation for the assertion (A).
**Assertion (A):** Permanent hardness of water is removed by treatment with washing soda.
**Reason (R):** Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.
The correct answer is option 'A', which states that both the assertion (A) and the reason (R) are correct, and the reason (R) is the correct explanation of the assertion (A).
**Explanation:**
Permanent hardness of water is caused by the presence of soluble calcium and magnesium salts, primarily calcium sulfate (CaSO4) and magnesium sulfate (MgSO4). These salts do not precipitate when water is boiled, unlike temporary hardness caused by the presence of bicarbonates. Therefore, an alternative method is required to remove permanent hardness.
Washing soda, also known as sodium carbonate (Na2CO3), is commonly used to remove permanent hardness. When washing soda is added to hard water, it reacts with the soluble calcium and magnesium salts to form insoluble carbonates. This reaction can be represented as follows:
CaSO4 + Na2CO3 -> CaCO3 + Na2SO4
MgSO4 + Na2CO3 -> MgCO3 + Na2SO4
The formed calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) are insoluble and can be easily removed by precipitation or filtration. The remaining sodium sulfate (Na2SO4) remains in solution and does not contribute to water hardness.
Therefore, washing soda effectively removes permanent hardness by converting the soluble calcium and magnesium salts into insoluble carbonates. This process is known as precipitation or chemical softening.
Hence, both the assertion (A) and the reason (R) are correct, and the reason (R) provides the correct explanation for the assertion (A).
Attention Class 11 Students!
To make sure you are not studying endlessly, EduRev has designed Class 11 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 11.
|
Explore Courses for Class 11 exam
|
|
Similar Class 11 Doubts
Top Courses for Class 11View all
Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer?
Question Description
Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer?.
Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11.
Download more important topics, notes, lectures and mock test series for Class 11 Exam by signing up for free.
Here you can find the meaning of Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Direction: In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the options given below each question.Assertion (A) : Permanent hardness of water is removed by treatment with washing soda.Reason (R) : Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble carbonates.a)Statement A and R both are correct and R is the correct explanation of A.b)A is correct but R is not correct.c)A and R both are correct but R is not the correct explanation of A.d)A and R both are false.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 11 tests.
|
|
Explore Courses for Class 11 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
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup