Give reasons for the following:
Red brown vapours are produced when concentrated sulphuric acid is added to potassium bromide

Give reasons for the following: A piece of wood becomes black when concentrated sulphuric acid is poured on it.

Explain the following: Blue colour of solid copper sulphate disappears when concentrated sulphuric acid is added to it.

Give balanced equation for the following: Dehydration of concentrated sulphuric acid with sugar crystals

How do you account for the following observations ? When concentrated sulphuric acid is added to an inorganic mixture containing chloride, we get colourless pungent smelling gas HCI, but if the mixture contains bromide then we get red vapour of bromine. Why?

Give reason for the following: Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.

Write the equation for each of the following reactions : Sulphur is heated with concentrated sulphuric acid.

State your observations when conc. sulphuric acid is added to sugar crystals.

Give reasons for the following Concentrated sulphuric acid is a weaker acid compared to dilute sulphuric acid.

What is observed when concentrated sulphuric acid is added drop wise to a crystal of copper sulphate?

Give reasons for the following In the electrolysis of acidified water dilute sulphuric acid is preferred to dilute nitric acid for acidification