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Q.

Assertion : In a pressure cooker, the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water starts boiling again.  
  Reason: The impurities in water bring down its boiling point

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a

The Assertion is correct but Reason is incorrect

b

Both the Assertion and Reason are incorrect. 

c

Both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

d

Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion

answer is C.

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Detailed Solution

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In a pressure cooker the water is brought to boil, if temperature is 100°C. When the lid of cooker is opened, pressure is lowered so that boiling point decreases and water boils again. Generally impurities increase the boiling point

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