Question

A small amount of iron sulphide in powdered form is taken ina test tube and 5 ml of carbon disulphide is added to it . The test tube is vigorously shaken . What is observed

Answer 1

When iron sulphide is added to carbon disulphide, both retain in their properties, i.e. they have not gone under any chemical reaction. Iron sulphide is a ionic compound and carbon disulphide is a non polar molecule. Iron sulphide is not soluble in carbon disulphide, hence the colour of carbon disulphide remains same (colourless). Therefore, this is a physical change.