For an ideal solution, the correct option is:

Options

1. A${∆}_{mix}S = 0$ at constant $T$ and $P$
2. B${∆}_{mix}V \ne 0$ at constant $T$ and $P$
3. C${∆}_{mix}H = 0$ at constant $T$ and $P$
4. D${∆}_{mix}G = 0$ at constant $T$ and $P$