### SAT - Science - Chemistry - Is Matter Around us Pure

#### Question - 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

#### Question - 2

Cut an apple and keep the slices exposed to air for sometime. Identify the true statement about the process.

• A The colour of the cut surface becomes brown.
• B The colour of the cut surface changes due to chemical change.
• C The colour change is irreversible
• D All the above

#### Question - 3

Match the following:

 List-I List-II a. CO2 1. mixture b. Graphite 2. Retains the properties of the constituents c. Air 3. contains only one type of atoms d. Soil 4. heterogeneous
• A a b c d 2 4 1 3
• B a b c d 2 3 1 4
• C a b c d 4 3 1 2
• D a b c d 2 1 3 4

#### Question - 4

No new substances are formed in which of the following reactions?

• A Combustion
• B neutralisation
• C Crystallisation
• D digestion

#### Question - 5

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

#### Question - 6

Identify the pure substance among the following.

• A Molten sodium chloride
• B Sugar solution
• C Aqueous sodium chloride
• D 10% H2S04

#### Question - 7

x g of an aqueous solution of a salt A contains y g of A. The solubility of A is

• A $\frac{y}{x}\times100$%
• B $\frac{y}{x-y}\times100$%
• C $\frac{x}{y-x}\times100$%
• D $\frac{x}{y}\times100$%

#### Question - 8

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

#### Question - 9

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

#### Question - 10

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