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Higher Study | Thermodynamics | Ideal and Real Gases

Which of the following options can always be approximated to be an ideal gas - 
Consider the following statement: 1) In an ideal gas, there are no intermolecular forces of attraction and repulsion. 2) At very low pressure, all gases and vapours approach ideal gas behaviour. 3) Enthalpy of an ideal gas depends only on temperature. Which of the above statements are correct?
Which one of the following substances has constant specific heat at all pressures and temperatures?
Which one of the following statements is correct for a superheated vapour?
What is the value of mass of the air in a room of size 4m × 5m × 6m at 100 kPa and 25°C ? (Take R = 0.287 kPa.m3.kg-1).K-1) 
In a throttling process, which of the following parameters remains constant?
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