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What is known as sublimation?

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Important Questions on Separation of Substances

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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Which of the following does not undergo sublimation?
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
A suitable method for the separation of pure naphthalene from sandy naphthalene is:
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
On heating camphor in a porcelain dish it got mixed in air without melting. This phenomenon is known as
EASY
Science>Chemistry>Separation of Substances>Principle and Method of Separation
Which of the following compound can not be sublimed?
MEDIUM
Science>Chemistry>Separation of Substances>Principle and Method of Separation
A student was given one packet containing white crystals of sodium chloride and another packet containing white crystals of ammonium chloride for carrying out a project. But he forgot to label the packets. One of his friends suggested him to carry out sublimation on each sample and to identify the sublimable solid. He then helped the student to set up the apparatus for carrying out sublimation and then jointly carried out sublimation of each sample separately.
A. Define sublimation.
B. What are sublimable solids? Give two examples of sublimable solids.
C. State the values demonstrated by the fellow student in helping his friend to identify the samples.
MEDIUM
Science>Chemistry>Separation of Substances>Principle and Method of Separation

Fill in the blank space by choosing correct words from the list given below . 
List : evaporation, churning, threshing, sieving, sedimentation, winnowing, condensation, hand-picking. 

Corn is separated from husk by the process of _____.

HARD
Science>Chemistry>Separation of Substances>Principle and Method of Separation
How will you obtain clear water from the muddy water, if you are provided with two glass tumblers and no other equipment?
MEDIUM
Science>Chemistry>Separation of Substances>Principle and Method of Separation
Explain the following:
Naphthalene balls disappear with time without leaving any solid.
 
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Which of the following will not sublime -
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Describe sedimentation and decantation with the help of diagrams.
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Two miscible liquids can be separated by the process of decantation.
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Differentiate between threshing and winnowing?
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Science>Chemistry>Separation of Substances>Principle and Method of Separation

Define the following with examples:

a. Sublimation.

b. Evaporation.

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Science>Chemistry>Separation of Substances>Principle and Method of Separation
Winnowing helps to remove heavy impurities.
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Science>Chemistry>Separation of Substances>Principle and Method of Separation
During loading this chemical substance is added to improve sedimentation.
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Science>Chemistry>Separation of Substances>Principle and Method of Separation

Name the following:
The process of pouring out the liquid without disturbing the sediments.

MEDIUM
Science>Chemistry>Separation of Substances>Principle and Method of Separation

Squeeze some drops of lime into a glass of milk. You will see a whitish solid forming after some time. Place a thin cloth over a bowl and pour the liquid on it. The white solid is left behind on the cloth and liquid collects in the bowl.

_____ is the process represented by adding lime to milk.

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MEDIUM
Science>Chemistry>Separation of Substances>Principle and Method of Separation
Which method is used for cleaning pulses and rice?
EASY
Science>Chemistry>Separation of Substances>Principle and Method of Separation

Define the following term:

Sublimation

HARD
Science>Chemistry>Separation of Substances>Principle and Method of Separation
Define sublimation. Describe an experiment to show the sublimation of a solid substance. Name two substances from your daily life that sublime on heating.