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Which of the following is NOT a correct statement of a gas law?

ABoyle's law: $P V =$ constant at constant $T$ and $n$
BCharles's law: $V / T =$ constant at constant $P$ and $n$
CAvogadro's law: $V / n =$ constant at constant $T$ and $P$
DGay-Lussac's law: $PT =$ constant at constant $V$ and $n$

Answer: D

Gay-Lussac's pressure-temperature law states

P / T =

constant at constant

V

and

n

, i.e.

P \propto T

, not

PT =

constant. The other three are correct.

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