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Question

At constant volume gas thermometer shows pressure reading of 50 cm and 90 cm of mercury at 0C and 100C respectively. When the pressure reading is 60 cm of mercury, the temperature is


A
25°C
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B
40°C
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C
12°C
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D
12.5°C
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Solution

The correct option is

A

25°C

tct0t100t0=pcp0p100p0;

wherepc=pressureatunknowntemperature,tc=unknowntemperature,p100=pressureat1000c,

p0=pressureat00c,t0=temperatureat00c

tc01000=60509050

tc100=605090501040

tc=14×100250c

tc=250c

Hence, the correct option is

A


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