Which of the following statement is/are correct? (a) All real gases are less compressible than i...

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Which of the following statement is/are correct?
(a) All real gases are less compressible than ideal gas at high pressure.
(b) Hydrogen and helium are more compressible than ideal gas for all values of pressure.
(c) Except \( \mathrm{H}_{2} \) and \( \mathrm{He} \), the compressibility factor \( \mathrm{Z}=\left(\frac{\mathrm{PV}}{\mathrm{nRT}}\right)1 \) for all gases at low pressure.
(d) The compressibility factor of real gases is independent of temperature.
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