Question

why sulphur get dissolved with when carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide

Answer 1

question itself needs some clarification . once you  verify . but what i know is The triple point of carbon dioxide is at 75.1 psi, or 5.11 atmospheres of pressure, and -56.6 degrees Celsius. Since this is greater than one atmosphere, 14.7 psi, dry ice does not melt. At atmospheric pressure carbon dioxide sublimes, or converts directly from a solid to a gas, at -78.5 degrees Celsius.