What is the change in temperature when a compressed real gas is allowed to expand adiabatically through a porous plug

When an ideal gas is suddenly allowed to expand adiabatically into an evacuated container, then

What is the change in pH values of milk when it changs into curd? Explain.

What is the change in the internal energy of an ideal gas,at constant temperature (isothermal process) ?

Write the relation between volume and temperature of an ideal gas undergoing an adiabatic process.

What is the effect of temperature and pressure on the adsorption of gas over the solid surface?

Two cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. Answer the following : (a) What is the final pressure of the gas in A and B ? (b) What is the change in internal energy of the gas ? (c) What is the change in the temperature of the gas ? (d) Do the intermediate states of the system (before settling to the final equilibrium state) lie on its P-V-T surface ?