Heavy Water

Q.

What is the molecular formula of Heavy Water?

Q. Soap forms a precipitate in hard water. Explain.

Q.

The nucleus of Helium contains

1. two neutrons and two protons

2. four protons

3. four protons and two electrons

4. four neutrons

Q.

Heavy water is used in atomic reactor as-

1. Both moderator and coolant

2. Neither coolant and moderator

3. Moderator

4. Coolant

Q. What are the practical applications of various isotopes? List a few of them.

Q.

What is the chemical formula of sulphide ore cinnabar?

Q.

What are the uses of heavy water?

1. Moderators in nuclear reactors

2. Preparation of deuterium

3. Tracer in chemical reactions

4. Rocket fuel

Q.

Soap forms insoluble precipitates with calcium and magnesium ions present in hard water.

1. True

2. False

Q.

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

1. Dil.NaOH

2. Pure water

3. Conc. NaOH solution

4. 50% H2SO4

Q.

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

1. Dil.NaOH

2. Pure water

3. Conc. NaOH solution

4. 50% H2SO4

Q. Elements of $IA$ group give colour in bunsen burner flame because of:

1. all of these
2. low melting point
3. low ionization potential
4. softness