Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Gypsum has lower density than anhydrite. Reason (R) : Hydrated minerals tend to expand many times the original volume of the anhydrous minerals. In the light of the above statements, choose the most appropriate answer from the options given below :
Assertion (A) Analysis: Gypsum vs. Anhydrite Density
Assertion (A) states that Gypsum has a lower density than anhydrite.
- Gypsum is the chemical compound calcium sulfate dihydrate (CaSO₄·2H₂O).
- Anhydrite is the chemical compound calcium sulfate (CaSO₄).
- Typical density values: Gypsum ≈ 2.32 g/cm³, Anhydrite ≈ 2.98 g/cm³.
Based on these values, Assertion (A) is correct.
Reason (R) Analysis: Hydrated Mineral Expansion
Reason (R) states that hydrated minerals tend to expand compared to their anhydrous minerals.
- When water molecules incorporate into the crystal structure of a mineral during hydration (forming a hydrated mineral from an anhydrous one), the volume occupied by the mineral typically increases.
- This increase in volume, while the mass remains relatively constant, leads to a decrease in density (Density = Mass / Volume).
Reason (R) is a correct general principle in mineralogy and is correct.
Relationship Between Assertion and Reason
The reason explains the assertion because:
- Gypsum is the hydrated form and anhydrite is the anhydrous form of calcium sulfate.
- As stated in Reason (R), hydration causes expansion. This means gypsum occupies a larger volume than anhydrite for the same amount of calcium sulfate.
- A larger volume results in lower density, directly explaining why gypsum has a lower density than anhydrite, as stated in Assertion (A).
Therefore, Reason (R) is the correct explanation for Assertion (A).
Final Answer Choice
Both Assertion (A) and Reason (R) are correct, and Reason (R) provides the correct explanation for Assertion (A).
The most appropriate option is: Both (A) and (R) are correct and (R) is the correct explanation of (A).
Similar Questions
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Drumlins show features opposite to those of Roches Moutonnees.
Reason (R) : The stoss side is steep and the lee side is roughened.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : In a hand specimen quartz can be easily distinguished from orthoclase.
Reason (R) : Orthoclase has lower refractive index than quartz.
In the light of the above statements, choose the most appropriate answer from the options given below :
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Chronostratigraphy is concerned with the mutual time relationship of strata.
Reason (R) : Formation, member and bed are units of chronostratigraphy.
In the light of the above statements, choose the most appropriate answer from the options given below :
Match List - I with List - II.
List - I
Mineral PropertyList - II
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Match List - I with List - II.
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Optical featureList - II
Optical diagramA. Wave front (isotropic) I. Ellipse B. Wave surface (isotropic) II. Sphere C. Wave front (anisotropic) III. ellipsoidal D. Wave surface (anisotropic) IV. circle Choose the correct answer from the options given below :
- A solid crystal in which a face on one side is opposite to a point on the other, is called :
- Which of the following pairs do not have the same number of classes in their crystal system ?
- The relative abundance of a particular face of a crystal is a function of :
- In case of dipping beds, progressively younger beds occur along the directions of dip if :
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Important Questions from Mixed Topic (CUET PG)
- Kalpsutra, the illustrated canonical text is from:-
- The Harappan city almost exclusively devoted to craft production was-:
- Mohandas Karamchand Gandhi launched quit India movement after the failure of:-
- The "Objectives Resolution" was introduced in constituent assembly by:-
- Who among the following was not a member of the constituent assembly:-
