Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Thorium is a by-product of the extraction of rare earths from monazite sands. Reason (R): India's Kakrapara-1 reactor is the world's first reactor which uses thorium. In the light of the above statements, choose the correct answer from the options given below:

• 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. A is false but R is true.

Hint:

Both statements are true, but R does not explain A.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:

• We must evaluate Assertion (A) on thorium and Reason (R) on Kakrapar-1.

Step 2: Detailed Explanation:

• Assertion (A) is true: thorium is obtained as a by-product while extracting rare earths from monazite sands.

• Reason (R) is true: Kakrapar-1 is regarded as the world's first reactor to use thorium (in its flux-flattening arrangement).

• Although both are true, the reactor fact does not explain why thorium is obtained from monazite sands.

Step 3: Final Answer:
Both A and R are true but R is NOT the correct explanation of A. The correct option is (B).