1- on heating solid yellow arsenic, it becomes a liquid , and by further heating from 100ºc   to 200ºc , it becomes solid black arsenic, by raising the temperature to 270ºc its colour becomes……greywhiteredviolet

A shiny brown coloured element 'X' on heating in air becomes blackin colour. Name the element and the black coloured compoundformed

Identify the non-metal which exhibits yellow colour.A.SiliconB.PhosphorusC.sulphurD.Carbon

On removal of water from [Ti(H2O)6 ]Cl3 on heating, it become colourless.

wo clear, colourless solutions are mixed together. When they are mixed, a yellow solid (precipitate) forms in the colourless solution. Justify how you know that a chemical change has happened.

Heat a few crystals of copper sulphatein a dry boiling tube.n What is the colour of the coppersulphate after heating?n Do you notice water droplets in theboiling tube? Where have these comefrom?n Add 2-3 drops of water on the sampleof copper sulphate obtained afterheating.n What do you observe? Is the bluecolour of copper sulphate restored?