One of four words is a class to which the other three belong. Identify the class.
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___ is not related to gases.
Calculate the time period (in seconds) of a sound wave of wavelength 5m travelling with a speed of 500 m/s.
___ is known as a disease mostly caused by occupational health hazards.
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What is the name of the book in Harry Potter series written by Jack Thorne to be published in mid - 2016?
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