Under which conditions of temperature and pressure does a sample of neon behave most like an ideal gas?
(1) 100 k and 0.25 atm
(2) 100 k and 25 atm
(3) 400 k and 0.25 atm
(4) 400 k and 25 atm

Since real gases behave least ideally at low temperature and high pressure, they would behave most like an ideal gas at high temperature and low pressure.
 Therefore, (3) 400K and 0.25 atm is the correct answer.
Hope this would help~

The answer is c) pyrite

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