Question

Statements about heavy water are given below:

$\left(A\right)$Heavy water is used in exchange reactions for the study of reaction mechanisms.

$\left(B\right)$ Heavy water is prepared by exhaustive electrolysis of water.

$\left(C\right)$ Heavy water has a higher boiling point than ordinary water.

$\left(D\right)$ The viscosity of $H_{2}O$ is greater than $D_{2}O$.

Which of the above statements are correct?

• A. A and B only
• B. A and D only
• C. A, B and C only
• D. A and C only

Answer 1

The correct option is C

A, B and C only

The explanation for the correct option:

In the case of option C,

1. Statement A: In the exchange reactions, cations and anions that were partners in the reactants are swapped out in the products. When the heavy water is used in the exchange reaction with any compound of hydrogen then hydrogen undergoes an exchange for Deuterium. This reaction is used to show the working of the exchange reaction. Thus statement A is correct.
2. Statement B: Deuterium oxide$\left(D_{2}O\right)$ is heavy water. Heavy water is present in ordinary water in trace amounts $\left(\frac{1}{6000}\text{parts}\right)$. It is made on a big scale by electrolysis of ordinary alkali-containing water. Generally, it s created by electrolysis of water with 3% Sodium hydroxide$\left(NaOH\right)$. Repeated distillation and condensation are also used to create it. It can also be obtained through an exchange transaction. Thus statement B is correct.
3. Statement C: Heavy water has a boiling point of $101·{42}^{°}C$, which is higher than regular water's boiling point of ${100}^{°}C$, due to its larger molar mass. Thus statement C is correct.
4. Statement D: The viscosity of $H_{2}O$ is $0.89\mathrm{centipoise}$ whereas the viscosity of $D_{2}O$ is $1.107\mathrm{centipoise}$. As viscosity of $D_{2}O$ is greater than that of $H_{2}O$. Therefore, we can conclude that statement D is incorrect.

Hence, statements A, B, and C are correct and D is incorrect.