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Is Matter Around us Pure- Class IX-Vasu Classes
1.
A pure substance consists of
a) different kind of particles
b) same kind of particles
c) Same kind of molecules
d) B and C
2.
Purity of a substance can be checked by
a) Microscope
b) By its MP and BP
c) By tasting it
d) None
3.
Homogeneous mixture of two or more substances is called
a) colloid
b) suspension
c) true solution
d) solvent
4.
15% Concentration of a solution means
a) 15gm of solute in 100gm solution
b) Mass of solvent in 100gm solution
c) 15gm of solute in 85gm water
d) all of the above
5.
If 40gm sugar is dissolved in 360gm water. The concentration of solution will be
a) 10%
b) 20%
c) 8%
d) 25%
6.
In which of the following the size of solute particles is more than 100nM
a) colloidal solution
b) true solution
c) suspension
d) None of the above
7.
A solution is said to be stable when its particles
a) do not settle down
b) remains in zig zag motion
c) settle down after some time
d) A & B
e) All of the above
8.
Which of the following show tyndal effect?
a) Milk
b) Common salt solution
c) Copper sulphate solution
d) B and C
e) A and B
9.
Which method is used to squeeze out water from wet clothes ?
a) Evaporation
b) Drying in air
c) Centrifugation
d) None
10.
When we obtain difeerent gases from air by fractional distillation , the order is
a) Argon ,oxygen ,nitrogen
b) nitrogen ,oxygen ,argon
c) nitrogen ,argon ,oxygen
d) oxygen ,nitrogen ,argon
11.
Which method can be used to obtain pure sugar from impure sugar?
a) Evaporation
b) Distillation
c) Chromatography
d) Crystallisation
12.
Which of the following is a compound?
a) Chalk
b) Gun powder
c) Brass
d) Tin
13.
Which of the following pairs does not contain both elements?
a) carbon ,silicon
b) helium ,nitrogen
c) bronze ,zinc
d) copper ,silver
14.
Which of the following is not a pure substance?
a) mercury
b) sugar
c) blood
d) salt
15.
Which one is odd in the given substances?
a) Ice
b) germanium
c) gold
d) graphite
16.
Which of the following methods can not be used to separate solution of solid and liquid?
a) distillation
b) separating funnel
c) crystallisation
d) evapoartion
17.
Adavntages of crystallisation are
a) Pure substance is obtained
b) Quick process
c) No charring of substance
d) A & C
e) All of the above
18.
Which of the following methods can be used to separate the constituents of a compound?
a) Chromatography
b) Distillation
c) Electrolysis
d) Fractional distillation
e) A and D
19.
Which of the following is a solvent can be used to dissolve iodine?
a) Carbon disulphide
b) alcohol
c) water
d) carbon tetra chloride
20.
At higher altitude
a) the B.P of water decreases
b) B.P increases
c) No change in B.P
21.
In what order the mixture of benzene , water and mercury
a) mercury , water , Benzene
b) benzene, water , mercury
c) mercury , benzene ,water
d) water , benzene , mercury
22.
name the method used to separate cream from milk
a) Centrifugation
b) Fractional distillation
c) Chromatography
d) Evaporation
23.
How will you separate a mixture of sugar and common salt
a) By using a suitable solvent
b) By adding water to mixture
c) Filteration
d) Crysatallisation
24.
Which of the following are sublimes
a) camphor , antracene , iodine
b) Iodine, common salt , ammonium chloride
c) Sugar, Iodine, camphor
d) None
25.
Suggest a method used to separate components of ink
a) Centrifugation
b) Distillation
c) Chromatography
d) Evaporation
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