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The most extensive, commercially useful source of thorium as monazite sand occurs in India at

  • A.Orissa coast
  • B.Travancore coast
  • C.West bengal coast
  • D.Gujarat coast

Answer: B

Monazite sand is found on the Travancore coast of Kerala.

The beach sands of Chavara and Manavalakurichi are among the richest monazite deposits in the world. Monazite is a phosphate of cerium and other rare earths containing about 8–10 per cent thorium, and India's thorium reserves are the basis of the third stage of its nuclear power programme.

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