Sublimation

Q.

A mixture of camphor and salt can be separated by the process of ___.

1. Centrifugation

2. Distillation

3. Sedimentation

4. Sublimation

Q.

What do you mean by sublimation? Explain with an example.

Q.

Describe an experiment to demonstrate the process of sublimation.

Q.

Why does the size of naphthalene balls decrease when left open?

Q.

The process by which a solid directly converts into its vapour state is called

1. Evaporation

2. Ebullition

3. Condensation

4. Sublimation

Q.

List few examples of deposition.

Q.

What is the function of evaporating dish in labs?

1. To collect acid from bottles

2. To collect solid residue from liquid evaporation

3. Used for sublimation tests

4. Both (b) and (c)

Q.

What is the principle of sublimation?

Q.

Sodium chloride undergoes sublimation.

1. True
2. False

Q.

The process by which matter in solid state changes to a gaseous state, due to an increase in temperature and/or decrease in pressure is called as ______________.

1. Evaporation

2. Condensation

3. Sublimation

4. Diffusion

Q.

Name two compounds which sublime on heating

Q.

Give one simple activity/experiment to show that ammonium chloride sublimes.

Q.

Tincture of iodine is a mixture of two materials iodine and alcohol. One of the material has a property that its solid form can be converted directly into vapours on heating by a process called X. Identify the material that sublimes and process X?

1. Volatile component:- Alcohol

   X:- Fractional distillation

2. Volatile component:- Alcohol

   X:- Melting

3. Volatile component:- Iodine

   X:- Sublimation

4. Volatile component:- Iodine

   X:- Distillation

Q.

Give two examples for each of the following :

(a) The substances which sublime.

(b) The substances which do not change their state on heating.

Q.

Differentiate between the following: Condensation and Sublimation

Q. What happens when you cool down camphor vapours?

1. They become liquid
2. They become solid
3. They remain in gaseous form
4. They start melting

Q.

How is heating of sugar different from heating of ammonium chloride ?

Q.

How will you justify that ice, water and steam are not different substances but different states of the same substance?

Q.

Suggest a suitable technique to separate the constituents of the following mixtures. Also give the reason for selecting the particular method.

(a) Salt from sea water

(b)Ammonium chloride from sand

(c)Chalk powder from water

(d)Iron from sulphur

(e)Water and alcohol

(f)Sodium chloride and potassium nitrate

(g)Calcium carbonate and sodium chloride.

Q.

If naphthalene balls are kept at room temperature then it undergoes the phase transition. Which of the below mentioned is correct in regard to naphthalene balls:-

1. Evaporation

2. Condensation

3. Ebullition

4. Sublimation

Q.

Match the entries of column I with column II.

Mixtures	Methods to separate mixtures
(a) Solid-liquid mixture (insoluble solid)	(i) Sublimation
(b) Liquid-liquid mixture (miscible liquids)	(ii) Separating funnel
(c) Solid-solid mixture (one component is more volatile)	(iii) Filtration
(d) Liquid-liquid mixture (immiscible liquids)	(iv) Distillation

1. (a) - (iii), (b) - (ii), (c) - (iv), (d) -(i)

2. (a) - (iv), (b) - (iii), (c) - (i), (d) -(ii)

3. (a) - (iii), (b) - (iv), (c) - (ii), (d) -(i)

4. (a) - (iii), (b) - (iv), (c) - (i), (d) -(ii)

Q.

Iodine is separated from a mixture of salt and iodine by this method.

Q.

Sublimation is when a ___ changes directly to a ___.

1. gas, liquid

2. plasma, gas

3. solid, liquid

4. solid, gas

Q.

Choose the substance that will not undergo sublimation.

1. Iodine

2. Ammonium chloride

3. Camphor

4. Bromine

Q.

___________ Process is used in separation of Ammonium Chloride and Salt. The volatile component among these is ____________________.

1. Sublimation Process, Salt

2. Centrifugation, Ammonium Chloride

3. Sublimation Process, Ammonium Chloride

4. Centrifugation , Ammonium Chloride

Q. Which among the following is the best method to separate a mixture of naphthalene and common salt?

1. Sublimation
2. Filtration
3. Distillation
4. Sedimentation

Q.

The substance which can readily sublime is:

1. Ammonium Chloride

2. Sodium Chloride

3. Hydrochloric acid

4. Chlorine gas

Q.

Ammonium Chloride and Salt is separated by ______________________ process and the volatile component among these is ____________________.

1. Centrifugation, salt

2. Sublimation, Ammonium Chloride

3. Sublimation, Salt

4. Centrifugation, Ammonium Chloride

Q. The process by which matter in its solid state directly changes to gaseous state is known as.

1. evaporation
2. condensation
3. sublimation

Q.

What is an example of supercooling?