Heavy Water

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

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

Q. 16.Determine correct order between H2O & H2O2 in each case with reason 1)Hydrogen bond strength 2)Extent of overlapping 3)Boiling point 4)Melting point

Q. 50 Potassium crystallizes in BCC unit cell with distance between nearest neighbours of 4.52 , if its atomic mass=39amu A what would be edge lenght of unit cell? B what would be the density of K metal ? C how many nearest neighbouring atoms does each potassium atom has?

Q. 95. Sulphur exist in different allottopic forms such as S2, S6 and S8. If equal weight of three are taken in separate container, then the ratio of number of atoms is?

Q.

When Ethyl magnesium bromide is treated with heavy water, the expected compound will be

1. C₂H₅D

2. C₂D₆

3. C₂H₃D₃

4. C₂H₅OD

Q.

$D_{2}O$ is used more in

1. Chemical industry

2. Nuclear reactor

3. Pharmaceutical preparations

4. Insecticide preparation

Q. 48gram of oxygen is obtined on heating KClO3 when it is 50% pure. Find mass of KClO3 required

Q.

In the electrolysis method of $D_2$O, electrolyte used is

1. 50% H2SO4

2. Dil.NaOH

3. Pure water

4. Conc. NaOH solution

Q. 13. Explain sp3 hybridisation of methane .

Q.

The velocity of neutrons in a nuclear reactor is slowed down by using:

1. heavy water $D_{2}O$

2. ordinary water $H_{2}O$

3. Zinc rod

4. fused caustic soda

Q. How relative lovering of vapour pressure is inversely proportional to molecular mass of solute (it is a constant right)? How hydrogen bond is formed btw acetone and chloroform, hydrogen bonding is only possible with hydrogen attached to oxygen, fluorine and nitrogen right?

Q.

Name the products(s) formed on heating sugar strongly in the absence of air.

Q. 22. Assertion : Freezing point of neopentane is more than that of n- pentane. Reason: increase in van der waals forces increases freezing point.

Q. The solubility of a gas in water which is exposed to the atmosphere, when the partial pressure is 700 mm is $1.4\times {10}^{-4}M$. What is the solubility of the gas at 760 mm and at same temperature?

1. $2.5\times {10}^{-2}M$
2. $4.1\times {10}^{-4}M$
3. $1500M$
4. $1.52\times {10}^{-4}M$

Q. Two liquids 'A' and 'B' have vapour pressure (in pure state) in the ratio $p_A^{\circ }:p_B^{\circ }=1:3$ at a certain temperature. Assume 'A' and 'B' form an ideal solution and the ratio of mole fractions of 'A' to 'B' in the vapour phase is 4 : 3. The the mole fraction of 'B' in the solution at the same temperature is:

1. $\frac{2}{4}$
2. $\frac{1}{5}$
3. $\frac{2}{3}$
4. $\frac{4}{5}$

Q.

why is boiling point of H2S is lower than H2O??

Q.

$D_2$O has maximum density at

1. 9°C

2. 11.6°C

3. 15.9°C

4. 20°C

Q.

the surface tension of which of the following liquids is maximum and why?

a)C₂H₅OH b)CH₃OH c)H₂O d)C₆H₆

Q.

When the solution of Phosphorous acid ($H_{3}P{O}_3$) in $D_{2}O$ is evoporated, which of the following acid is formed?

A.$D_{3}P{O}_3$ B.$D{H}_{2}P{O}_3$ C. $D_{2}HP{O}_3$

1. B and C
2. A and B
3. A and C
4. A, B and C

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. A metal oxide has 60% of oxygen by Mass. What is the equivalent mass of this metal?

Q.

Among the following which is an exchange reaction?

1. N₂O₅ + D₂O → 2DNO₃

2. Ca₃P₂ + 6D₂O →3Ca(OD)₂ + 2PD₃

3. Na₂O + D₂O → 2NaOD

4. H₂S + D₂O → D₂S + H₂O

Q.

When the solution of Phosphorous acid ($H_{3}P{O}_3$) in $D_{2}O$ is evoporated, which of the following acid is formed?

A.$D_{3}P{O}_3$ B.$D{H}_{2}P{O}_3$ C. $D_{2}HP{O}_3$

1. B and C

2. A and B

3. A and C

4. A, B and C

Q. what is difference between isobars, isotopes and isotonic

Q. The vapour pressure of pure liquids 1 and 2 are $450mmHg$ and $700mmHg$ respectively at $350K$.
When total vapour pressureof the solution is $600mmHg$, the mole fraction of component 1 in liquid phase will be:

1. 0.4
2. 0.7
3. 0.3
4. 0.6

Q. 30 Whether Isotopes and isobars concepts are given on the basis of atomic mass or on the basis of mass number ?? Kindly make it clear with differentiating the mass number and atomic mass.

Q. Heavy water is obtained by

1. Boiling water
2. Fractional distillation of water
3. Prolonged electrolysis of water
4. Heating $H_2{O}_2$

Q. Intermolecular hydrogen bonding increases the enthalpy of vapourization of a liquid due to

1. decrease in the attraction between molecules

2. increase in the attraction between molecules

3. decrease in the molar mass of unassociated liquid molecules.

4. Increase in the effective molar mass of Hydrogen-bonded molecules.

Q.

When Ethyl magnesium bromide is treated with heavy water, the expected compound will be

1. $C_2$$H_5$D

2. $C_2$$H_5$OD

3. $C_2$$D_6$

4. $C_2$$H_3$$D_3$

Q. Name two intermolecule forces that exist between HF molevules in liquid state