MEDIUM
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How would you separate a mixture of rice, sugar and iron filings?

Important Questions on Matter: Elements, Compounds and Mixtures

EASY
Which of the following contain five molecules of water of crystallisation?
HARD

At a refinery, petroleum is separated into several components by a process called fractional distillation using a fractionating column. Which of the following statement is incorrect about the process?
(I) Temperature decreases from the bottom to the top of the column
(II) At each level in the column only one compound is collected
(III) The fraction collecting at the top of the column is less volatile
(IV) The fraction with the highest boiling point condenses first and gets collected near the base of the fractionating column.

EASY
On heating camphor in a porcelain dish it got mixed in air without melting. This phenomenon is known as
EASY

Sample 'A' contains iron filings and sulphur powder, Sample 'B' is iron sulphide. Sample 'A' and 'B' are taken on a watch glass and a bar magnet is rolled over both.

Question Image 

You will observe that: 

HARD
How will you separate a mixture of common salt, sand and iron filings?
EASY
Name the method which can be used to separate iron nails from sawdust.
MEDIUM

Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.

MEDIUM
The correct order of steps to separate different components of a mixture containing iron filings, sand and ammonium chloride is:
EASY
What method(s) of separation would you use to separate sand and iron filings?
MEDIUM
How is scrap iron separated from a heap of waste materials in factories?
EASY

Give the characteristic test for the following gas.

 H2

MEDIUM
You are given a mixture of iron filings and sulphur powder. How will you separate them from the mixture?
MEDIUM
A dish contains a blackish-yellow powder. When a magnet is moved over it, black particles (iron) get stuck to the magnet, and only a yellow powder, which is sulphur, is left behind. Was your original powder an element, compound or mixture?
EASY
Where can we use the magnetic separation method to separate the components of a mixture?
EASY
How will you separate a mixture of sulphur and iron filings?
EASY
If we heat a mixture of iron and sulphur, can we separate the iron with the help of a magnet?
MEDIUM
Which separation technique will you apply for the separation of iron pins from sand?
MEDIUM

Give reason for the following statement:

Magnetic separation cannot be used to separate a mixture of copper and sulphur.