Below are two statements. One is labeled as A | vedclass

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(D) Assertion $(A)$ is true because gypsum $(CaSO_4 \cdot 2H_2O)$ is used in the construction of fireproof wall boards due to its low thermal conducti

Vedclass · Accepted Answer

Both $A$ and $R$ are true,and $R$ is the correct explanation of $A$.

Vedclass · Answer

(D) Assertion $(A)$ is true because gypsum $(CaSO_4 \cdot 2H_2O)$ is used in the construction of fireproof wall boards due to its low thermal conductivity and the presence of water of crystallization.Reason $(R)$ is also true because gypsum loses its water of crystallization when heated to high temperatures (forming Plaster of Paris at $393 \ K$ and anhydrous calcium sulfate at higher temperatures),which makes it lose its structural integrity.Since the fireproof nature of gypsum boards is specifically due to the endothermic release of water vapor when exposed to heat,which prevents the temperature of the wall from rising rapidly,the reason $R$ correctly explains why it is used for fireproofing. Thus,both $A$ and $R$ are true and $R$ is the correct explanation of $A$.

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