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⁞ Chemistry

General Science ➤ Chemistry ➤ 1
Question 16
Q16.  Which of the following is an organic rock ?
 

Answer :  Coal


Coal is an organic sedimentary rock that forms mainly from plant debris. The plant debris usually accumulates in a swamp environment.
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Question 17
Q17.  Acid rain is caused by
 

Answer :  SO2 and NO2


Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide, resulting from fossil fuel combustion. Acid rain occurs when these gases react in the atmosphere with water, oxygen, and other chemicals to form various acidic compounds. The result is a mild solution of sulphuric acid and nitric acid.
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Question 18
Q18.  Mercury is generally used in thermometers because it has a
 

Answer :  high conductivity


Mercury is the only one in liquid state at room temperature. It is used in thermometers because it has high coefficient of expansion. It also has a high boiling point which makes it very suitable to measure higher temperatures. Due to high conductivity and low specific heat, a mercury thermometer acquires thermal equilibrium with the surrounding body more quickly.
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Question 19
Q19.  Darkening property of photo chromatic glass is due to the presence of
 

Answer :  silver chloride


Silver Chloride has the unusual property of darkening when struck by light. It is this property that makes silver halide salts so useful for photographic films. This darkening occurs because light causes an electron transfer from Cl- to Ag+ in the silver chloride crustal, where they aggregate to form a tiny crystal of silver metal which is opaque to light.
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Question 20
Q20.  Supersonic aircrafts discharge the following substance into the atmosphere :
 

Answer :  NO2


They discharge gases and particles (carbon dioxide, water vapour (H2O) Nitric Oxide (NO), Nitrogen dioxide (NO2), Sulfur dioxide (SO2) and soot.
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