Question

Write the chemical equation of the following?1.change in colour

Answer 1

The chemical reaction between citric acid and purple coloured potassium permanganate solution is characterised by change in colour (from purple to colourless).
2. The reaction between quick lime and water to form slaked lime is characterised by a change in temperature.Ca + 2H2O —–> Ca(OH)2 + H2 3.na2so4+bacl=baso4+nacl

Answer 2

sulphur dioxide gas reduces acidic potassium dichromate. hence orange color becomes the green coloured solution due to the formation of chromic ion in end.