Which of the following statements about gases is incorrect?

The pressure decreases as the temperature increases.

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Air has a measurable mass.

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The density of an air sample decreases as pressure decreases.

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The pressure decreases as altitude increases.

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Solution

The correct option is A The pressure decreases as the temperature increases.
According to gas law
Pressure $\propto$ Temperature
$P V = n R T$ , at constant valence & moles of any gas, Pressure $\propto$ Temperature.
Thus, on increase of Temperature Pressure increases.

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Which of the following statements about gases is incorrect?

The correct option is A The pressure decreases as the temperature increases.According to gas lawPressure ∝ TemperaturePV=nRT , at constant valence & moles of any gas, Pressure ∝ Temperature.Thus, on increase of Temperature Pressure increases.

The correct option is A The pressure decreases as the temperature increases.
According to gas law
Pressure $\propto$ Temperature
$P V = n R T$ , at constant valence & moles of any gas, Pressure $\propto$ Temperature.
Thus, on increase of Temperature Pressure increases.