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 :

• A. (B) only
• B. (C) only
• C. (D) only
• D. (B) and (D) only

Answer 1

The correct option is C (D) only

The dielectric constant of $H_{2}O$ is higher than the dielectric constant of $D_{2}O$. This is due to the lower molar mass of $H_{2}O$ as compared to that of $D_{2}O$.

Due to this, $NaCl$ (and other ionic compounds) dissolve more in $H_{2}O$ than in $D_{2}O$
Thus, statement (D) is incorrect.

Heavy water is used in exchange reactions for the study of reaction mechanisms.

Heavy water is used as a moderator in nuclear reactors as it slows down the fast moving neutrons and helps in controlling the nuclear fission process.

Heavy water is obtained as a by-product in fertilizer industry.
All other statements are true.
Hence, option (c) is the correct answer.