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OTI365 - NTSE - X Standard
NTSE SAT Chemistry - Is Matter Around us Pure Important Questions with Answer

SAT Chemistry - Is Matter Around us Pure

Exam Duration: 45 Mins Total Questions : 30

1 )

Which of the following processes is considered as only physical change?

(a)
Combustion of petrol in automobile engine
(b)
Photosynthesis
(c)
Condensation of water vapour
(d)
Tarnishing of silver

2 )

A mixture consists of three compounds A, B and C. A and C are soluble in water and C is sublimable. The correct sequence by which the following techniques can
be used for their separation is
i) Dissolution in water
ii) Sublimation
iii) Crystallisation
iv) Filtration

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

3 )

Identify the pure substance among the following.

(a)
Molten sodium chloride
(b)
Sugar solution
(c)
Aqueous sodium chloride
(d)
10% H₂S0₄

4 )

Which of the following is not a homogeneous mixture?

(a)
Bronze
(b)
A mixture of O₂ and He
(c)
Milk
(d)
A mixture of kerosene and petrol

Solution :

S-8; Xe - 1 ; Cl₂ - 2 ; O₃ - 3

5 )

Arrange the following elements in the increasing order
of the number of atoms per molecule.
i) Sulphur
ii) Xenon
iii)Chlorine
iv) Ozone

(a)
ii < iii < iv < i
(b)
ii < iv < iii <i
(c)
i < ii < iii < iv
(d)
i < iii < ii < iv

6 )

Arrange the following in the order of element, homogeneo.usmixture, compound and heterogeneous mixture.
m) Charcoaland water
n) Copper
0) Quicklime
p) Vinegar

(a)
mnop
(b)
npmo
(c)
npom
(d)
pomn

Solution :

element - copper (n) ; homogeneous mixture-vinegar (p)
compound - CaO heterogeneous mixture -charcoal and water (m)

7 )

A mixture contains saw dust, sodium chloride and naphthalene.Which of the following methods can be used for the separation of the components?
m) Dissolutionin water
n) Separating funnel
o) Sublimation
p) Evaporation
q) filtration

(a)
o, m, q, n
(b)
o, m, q, p
(c)
m, n, q, p
(d)
rn, q, o, p

Solution :

Sublimation ➝ dissolution in water ➝ filteration ➝ evaporation

8 )

Sodawater is a saturated solution of CO₂ in water. If the temperature of the solution is increased it becomes unsaturated. Identify the true statement about
the given data.

(a)
solubility of CO₂decreases with temperature
(b)
Solubility of CO₂ increases with temperature
(c)
Solubility of CO₂ is independent of temperature
(d)
The solubility of gas in liquid depends only on pressure.

Solution :

The solubility of a gas in liquid increases with pressure and decreases with temperature.

9 )

Which of the following solutions will show Tyndall effect?
i) River water
ii) Starch solution
iii) Muddy water
iv) distilled water

(a)
i and ii
(b)
ii and iii
(c)
iv only
(d)
i,ii and iii

10 )

The monoatomic gas among the following is

(a)
Hydrogen
(b)
Helium
(c)
Oxygen
(d)
Nitrogen

11 )

Identify the compounds among the following.
I) Marble
II) Silicon
III) Silica
IV) Water

(a)
I and II
(b)
I and III
(c)
IV only
(d)
I, III and IV

12 )

Tyndall effect is shown by

(a)
Sugar solution
(b)
Salt solution
(c)
Soap solution
(d)
Muddy water

13 )

Mark the correct statement

(a)
Burning of paper does not produce any newsustance.
(b)
Respiration is a chemical change.
(c)
The fizz that comes out when a soda bottle is opened is due to a chemical change
(d)
Crystallisation is a chemical change

14 )

What happens when LPG bums?

(a)
New substances are formed
(b)
Energy is released
(c)
Reversible change takes place
(d)
Both A and B

15 )

Which of the following mixture is not homogeneous?

(a)
Aerated drinks
(b)
Sulphur in carbon tetrachloride
(c)
Sulphur in water
(d)
Water and ethanol

16 )

A mixture of ammonium chloride and sodium chloride can be separated by

(a)
magnetic separation
(b)
Sublimation
(c)
solvent extraction
(d)
filtration

17 )

Which of the following is a compound?

(a)
Air
(b)
Milk
(c)
Iodine
(d)
Water

18 )

The particle size of solute in true solution is of the order of

(a)
10^-6m
(b)
10^-7m
(c)
10^-8m
(d)
10^-9m

19 )

The concentration of solution is the mass of the solute in grams, which is present in

(a)
10 gm of solvent
(b)
10 gm of solution
(c)
100gmofsolvent
(d)
100 gm of solution

20 )

A solution, which at a given temperature dissolves as much solute as it is capable of dissolving, is said to be a

(a)
saturated solution
(b)
semi saturated solution
(c)
unsaturated solution
(d)
super saturated solution

21 )

Which of the following is not a compound?

(a)
Marble
(b)
Washing soda
(c)
Quick lime
(d)
Brass

22 )

Air is regarded as a

(a)
compound
(b)
mixture
(c)
element
(d)
electrolyte

23 )

Which of the following statement is not true about suspension?

(a)
The particles of suspension can be separated from solvent by the process of filtration.
(b)
When the suspension is kept undisturbed the particles of suspension settle down.
(c)
A suspension is homogeneous in nature.
(d)
Scattering of light take place in suspension

24 )

Soap solution is an example of -