The behavior of a gas is non-ideal at

Explanation

Gases are considered ideal under certain conditions, such as low pressure and high temperature. Under these conditions, gas particles are assumed to have negligible volume and exert negligible attractive forces on each other.However, at high pressures, gas particles are closer together, and intermolecular forces become more significant. Additionally, at high temperatures, gas particles may not behave as ideally due to increased kinetic energy.So, the non-ideality of a gas is more likely to be observed at high temperature and high pressure, making option (b) the correct answer.