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Class 9
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Distinguish Between Mixture and Compound
Distinguish Between Mixture and Compound
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1)
Which compound is formed during the chemical reaction between iron & sulphur in the lab?
FeS
Fe₂S₃
FeS₂
FeS₃
2)
A student, by mistake, mixed iron filings and sulphur powder. He wanted to separate them. Which would you advise him to use to dissolve the mixture?
Boiling water
Cold water
Carbon disulphide
Warm water
3)
Name the gas obtained when dil. HCl is added to a mixture of iron and sulphur.
SO₂
H₂S
H₂
SO₃
4)
How would you separate iron from a mixture of iron and sulphur?
Add water to the mixture, followed by filtration.
Use a bar magnet.
By centrifugation.
By heating.
5)
The gas obtained by the reaction of FeS with dil. HCl is:
Sulphur dioxide
Sulphur trioxide
Oxygen
Hydrogen sulphide
6)
Name the product(s) obtained by the reaction of CuSO₄ (aq) with H₂S (g).
CuS (s) & H₂SO₄ (aq)
CuO (s) ,H₂O (l) & SO₂(g)
CuS (aq) & H₂O (l)
CuO (s), SO₂ (g) & H₂ (g)
7)
When you add carbon disulphide in a test tube containing a mixture of iron filings and sulphur, what do you observe after shaking the test tube well?
Some brown gases are evolved.
Sulphur dissolves to form colourless solution and iron filings settle down.
A yellow solution is formed and iron filings settle down.
After some time carbon disulphide, sulphur and iron filings form three separate layers in the test tube.
8)
When a mixture of iron filings and sulphur is strongly heated in a china dish, what is the colour of the product obtained?
Grey
Orange
Black
Pale yellow
9)
The smell of H₂S gas is ________.
Pleasant
Fishy
Odourless
Of rotten eggs
10)
In a laboratory, what precautions must be taken with carbon disulphide?
Keep it away from flame.
Kept it away from carbon.
Keep it away from distilled water.
Keep it away from iron sulphide.