Refers to the following experiment, which was set up and observed periodically for 1 hour:After 1 hour the following observations were made EXCEPTAThe solution had become paler blueBThe zinc rod had decreased in sizeCThe volume of the solution had decreasedDPink particles had collected at the bottom of the beaker

What is the indication of completion of reaction is this experiment?

Which amongst the following can be observed when zinc granules are added to dilute hydrochloric acid taken in a test tube?

What does in situ mean, in the context of this experiment?

The colour of the solution observed after 30 minutes of placing zinc metal to coppersulphate solution isa) Blueb) Colourlessc) Dirty greend) Reddish Brown

perimentProcedureObservationIWhite powder is added to water.Gas is given off.IIA solution is heated until it boils.Vapour rises, and solute is left in the beaker.IIIYellow powder is added to water.Yellow powder is added to water.IVA pure solution is added to another pure solution.A powder appears at the bottom of the beaker.In which two of the experiments did a physical change occur?