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⁞ Chemistry

General Science ➤ Chemistry ➤ 2
Question 36
Q36.  Which of these polymers is formed by addition polymerization process?
 

Answer :  All of the above


Some of the polymers formed by addition polymerization process are polyethene, example , terylene, nylon, polypropylene, polybutadiene, polyvinylchloride.
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Question 37
Q37.  Which among the following metals is the hardest metal?
 

Answer :  Tungsten


Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals. Tungsten has the highest melting point (3422 °C, 6192 °F), lowest vapor pressure (at temperatures above 1650 °C, 3000 °F).
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Question 38
Q38.  What is the main constituent of coal gas?
 

Answer :  Methane


By the destructive distillation of coal, we can obtain coal gas, coal tar and ammonia. Coke is left as a residue. Coal gas contains methane, carbon monoxide and hydrogen. Since all the three are combustible, coal gas is a good fuel with a high calorific value.
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Question 39
Q39.  Which base is present in milk of magnesia?
 

Answer :  Magnesium hydroxide


Magnesium hydroxide is the inorganic compound with the chemical formula Mg(OH)₂. It occurs in nature as the mineral brucite. It is a white solid with low solubility in water. Magnesium hydroxide is a common component of antacids, such as milk of magnesia, as well as laxatives.
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Question 40
Q40.  The principle that equal volumes of all gases contain the same number of molecules when under the same conditions of pressure and temperature was given by?
 

Answer :  Amedeo Avogadro


Amedeo Avogadro (1776 – 1856) was an Italian scientist who came up with Avogadro’s law which states that equal volumes of all gases contain the same number of molecules when under the same conditions of pressure and temperature. The Avogadro constant was named after him.
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