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Question

Assertion :The melting point of ice and boiling point of water are taken as the LFP and UFP of all the thermometer scales Reason: Thermometer works on the principle of thermal expansion of liquids

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is D Assertion is incorrect but Reason is correct
Not in all thermometer, for example Kelvin thermometer, the LFP is triple point of water.
The sensitivity of liquid to expand due to change in temperature is the working principle of thermometer.
Hence option D is correct.

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