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Test: Is Matter Around Us Pure - 1 - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Is Matter Around Us Pure - 1

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Test: Is Matter Around Us Pure - 1 - Question 1

A pure substance/element contains:

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 1
  • A pure element or compound contains only one substance, with no other substances mixed in.
  • Impure materials may be mixtures of elements, mixtures of compounds, or mixtures of elements and compounds.
Test: Is Matter Around Us Pure - 1 - Question 2

The smell of hydrogen sulphide (H2S) gas:

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 2

Hydrogen sulfide is a flammable, colorless gas with a characteristic odour of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.

Test: Is Matter Around Us Pure - 1 - Question 3

Which of the following is not a mixture? 

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 3

Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.

Test: Is Matter Around Us Pure - 1 - Question 4

In a water-sugar solution

Test: Is Matter Around Us Pure - 1 - Question 5

Which of the following is a chemical change? 

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 5

Cooking of food is a chemical change because after cooking, the raw ingredients or the vegetables cannot be regained again in the raw form.

Test: Is Matter Around Us Pure - 1 - Question 6

The process of separation of insoluble solids from a liquid is called:

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 6

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate).

Test: Is Matter Around Us Pure - 1 - Question 7

Which of the following has the highest solubility at 313 K? 

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 7


∴ KNO3 has the highest solubility at 313 K.

Test: Is Matter Around Us Pure - 1 - Question 8

An example of a liquid metal and a liquid non-metal is:

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 8

Mercury is the only liquid metal and bromine is the only liquid non-metal. 

Mercury:

  • Mercury is the only metal that is a liquid at normal temperatures and pressure. 
  • Because of the behavior of the valence electrons, mercury has a low melting point, is an electrical and thermal conductor and doesn't form diatomic mercury molecules in the gas phase

Bromine:

  • Bromine has 35 electrons and with7 electrons in its outer shell it has a valency of 1 so, is very reactive. 
  • But, the electrons are very spread out from the atomic nucleus, hence it behaves like a liquid.
  • It is non-metallic because it is a halogen gas that is liquid at STP.
Test: Is Matter Around Us Pure - 1 - Question 9

Alloys are:

Detailed Solution for Test: Is Matter Around Us Pure - 1 - Question 9

Alloys are homogeneous mixtures of two or more elements. The elements could be two metals, or a metal and a non-metal.
Example: Brass is an example of a substitution alloy of copper and zinc.

Test: Is Matter Around Us Pure - 1 - Question 10

Which of the following methods would you use to separate cream from milk?

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