Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The ability of a fired body to absorb water by capillary action. In a plastic clay the interstitial spaces between the clay and other mineral particles are filled with water.
Reason R: Clay fixed at on just above $600^{\circ}C$ becomes an extremely porous body.
In the light of the above statements, choose the most appropriate answer from the options given below

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct but R is NOT the correct explanation of A.
• C. A is correct but R is not correct.
• D. A is not correct but R is correct.

Hint:

Logic Tip: R describes a fired state (bisque). A describes a wet state (plasticity). One does not cause the other; they are just two different facts.

Answer 1

The Correct Option is B

Concept:
Understanding the relationship between water and clay involves studying porosity (empty spaces in a fired body) and plasticity (water suspended between particles in raw clay).

Step 1:
The assertion contains two independent technical definitions. The first sentence describes porosity (capillary absorption in fired wares). The second sentence accurately describes the mechanics of raw, plastic clay, where water acts as a lubricant between the interstitial spaces of clay platelets. Both technical statements are factually correct.

Step 2:
When raw clay is fired past the ceramic change (around $500^{\circ}C - 600^{\circ}C$), the chemical water is driven out, leaving behind a hard, permanent matrix full of microscopic holes. This bisque-fired state is indeed extremely porous. Thus, Reason R is correct.

Step 3:
Assertion A defines general physical states (capillary action and plastic clay mechanics). Reason R states that low-fired clay is porous. While they are conceptually related under the umbrella of "water and clay," firing clay to $600^{\circ}C$ (Reason R) does not cause or explain why plastic clay has water in its interstitial spaces (Assertion A).

Step 4:
Because both statements represent independent factual truths about ceramics, but lack a direct cause-and-effect relationship, Option 2 is correct. \[ \boxed{\text{(2) Both A and R are correct but R is NOT the correct explanation of A.}} \]