Question:

The INCORRECT statement(s) about heavy water is (are)

(A) used as a moderator in nuclear reactor

(B) obtained as a by-product in fertilizer industry

(C) used for the study of reaction mechanism

(D) has a higher dielectric constant than water

Choose the correct answer from the options given below :

Show Hint

Check each statement: \(D_2O\) has a slightly lower dielectric constant than \(H_2O\).
Updated On: Nov 4, 2026
  • (D) only
  • (B) and (D) only
  • (B) only
  • (C) only
Show Solution
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The Correct Option is A

Solution and Explanation

(A) \(D_2O\) slows down neutrons without absorbing them, so it is used as a moderator: correct.
(B) \(D_2O\) is obtained as a by-product of electrolysis of water in fertilizer plants (hydrogen production): correct.
(C) Used as a tracer for studying reaction mechanisms (isotope labelling): correct.
(D) Dielectric constant of \(D_2O\) (78.06) is slightly lower than that of \(H_2O\) (78.39): the statement is incorrect.
Only (D) is incorrect.
Answer: (1) (D) only
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