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Q.

Water boils at lower temperature on high altitudes because

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a

atmospheric pressure is high there

b

atmospheric pressure is lower there

c

water is weakly Hydrogen bonded there

d

water in pure form is found there

answer is B.

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Detailed Solution

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  • The boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure. 
  • A liquid boils when its vapor pressure exceeds the local total pressure. 
  • As the atmospheric pressure drops, the vapor pressure increases more than the local pressure at an even lower temperature. 
  • At sea level water boils at 100°C. 
  • For each 500 ft increase in elevation, the boiling point of water is lowered by approximately 0.5°C.
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