For a hypothetical gas containing molecules as point masses and having non-zero intermolecular attractions, which of the following is correct?

The gas shows positive deviations from ideal gas behavior

Graph of $Z\mathrm{v}/\mathrm{s}\frac{1}{V}$ at a particular temperature will have negative slope

The gas will be difficult to compress as compared to ideal gas

2 moles of the gas at a temperature of 273 K can be stored in a 45 litre of container at 1 atm pressures