Heavy Water

Q.

$D_2$O has maximum density at

1. $9^{\circ }$C

2. ${11.6}^{\circ }$C

3. ${15.9}^{\circ }$C

4. ${20}^{\circ }$C

Q. Which of the following is used as moderator in nuclear reactor?

1. Heavy water
2. Ozone
3. Heavy hydrogen
4. Hydrogen peroxide

Q.

Heavy water ($D_{2}O$) is

1. a product of oxygen and hydrogen

2. water of mineral springs

3. water obtained by repeated distillation and condensation

4. ordinary water containing dissolved salts of heavy metals

Q.

Identify the reaction given below:

NaOH + $D_2$O $\to$ NaOD + HDO.

1. Deuterolysis reaction

2. Hydrolysis reaction

3. Softening of hard water

4. Exchange reaction

Q.

$D_{2}O$ is used more in

1. Chemical industry

2. Nuclear reactor

3. Pharmaceutical preparations

4. Insecticide preparation

Q. Among two solvents $H_{2}Oand{D}_{2}O$, pick up correct relation/statement

1. $H_2$O : High dielectric constant, low molar mass
2. $D_2$O: High dielectric constant, high molar mass
3. Both have same dielectric constant
4. $D_2$O: Low dielectric constant, high molar mass

Q. Mass percentage of deuterium in heavy water is:

1. Same as that of protium in water
2. $11.1$
3. $20.0$
4. Cannot be predicted