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In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.
Choose the correct option out of the choices given below each question.
Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.
Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.
- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)Both A and R are false.
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In the following question, a statement of Assertion (A) followed by a...
Within the cations layers ions are held together by strong electrovalent bonds. But these separated ion layers are linked by a relatively weak H-bond. The weaker H-bond links calcium ions in the intermediate region. Consequently, the gypsum can be readily cleaved and stretched along the layer of water molecules.
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Anhydride has a completely ionic structure involving only calcium and sulphate ions.
Most Upvoted Answer
In the following question, a statement of Assertion (A) followed by a...
Assertion and Reasoning
Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.
Reason (R): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.
Explanation
The given assertion and reason can be explained as follows:
- Assertion (A) is true. Gypsum is a hydrated calcium sulfate mineral with the chemical formula CaSO4, 2H2O. It is a soft mineral that can be easily scratched with a fingernail. It has a hardness of 1.5 to 2 on the Mohs scale of mineral hardness, which makes it one of the softest minerals. Gypsum crystals are also easily cleaved along their planes of weakness, which makes it an ideal mineral for making plaster and other construction materials.
- Reason (R) is also true. Anhydrite is an anhydrous calcium sulfate mineral with the chemical formula CaSO4. It is a hard mineral with a Mohs hardness of 3.5 to 4.5, which makes it harder than gypsum. Anhydrite crystals are also difficult to cleave because they lack the planes of weakness that are present in gypsum crystals.
Therefore, both Assertion (A) and Reason (R) are true. However, Reason (R) is not the correct explanation of Assertion (A) because the two statements are describing different properties of two different minerals. The fact that anhydrite is harder and more difficult to cleave than gypsum does not explain why gypsum crystals are soft and easily cleaved.
Hence, the correct answer is option (B).
Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.
Reason (R): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.
Explanation
The given assertion and reason can be explained as follows:
- Assertion (A) is true. Gypsum is a hydrated calcium sulfate mineral with the chemical formula CaSO4, 2H2O. It is a soft mineral that can be easily scratched with a fingernail. It has a hardness of 1.5 to 2 on the Mohs scale of mineral hardness, which makes it one of the softest minerals. Gypsum crystals are also easily cleaved along their planes of weakness, which makes it an ideal mineral for making plaster and other construction materials.
- Reason (R) is also true. Anhydrite is an anhydrous calcium sulfate mineral with the chemical formula CaSO4. It is a hard mineral with a Mohs hardness of 3.5 to 4.5, which makes it harder than gypsum. Anhydrite crystals are also difficult to cleave because they lack the planes of weakness that are present in gypsum crystals.
Therefore, both Assertion (A) and Reason (R) are true. However, Reason (R) is not the correct explanation of Assertion (A) because the two statements are describing different properties of two different minerals. The fact that anhydrite is harder and more difficult to cleave than gypsum does not explain why gypsum crystals are soft and easily cleaved.
Hence, the correct answer is option (B).
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In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. Can you explain this answer?
Question Description
In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. 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 In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. 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 In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. Can you explain this answer?.
In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. 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 In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. 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 In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given.Choose the correct option out of the choices given below each question.Assertion (A): Crystals of hydrated calcium sulphate (gypsum: CaSO4, 2H2O) are soft and easily cleaved.Reason(B): Crystals of anhydrous calcium sulphate (anhydrite: CaSO4) are very hard and very difficult to cleave.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is not the correct explanation of A.c)A is true but R is false.d)Both A and R are false.Correct answer is option 'B'. Can you explain this answer?.
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