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The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of ...

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres by 57°C. The tyre pressure had by the afternoon was
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  • A Increased by 15.0cm Hg
  • B Decreased by 15.0cm Hg
  • C Increased by 22.50cm
  • D Decreased by 22.50cm Hg
  • E Remained constant
Correct Answer: Option A
Explanation:
\(\frac{P_1}{T_1}\) = \(\frac{P_2}{T_2}\) at constant volume
\(\frac{150}{27 + 273}\) = \(\frac{P_1}{57 + 273}\)
P2 = 165cmHg

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