When we put a drop of, red ink in 100 ml. of water, we observe that all the water becomes purple in colour after some time. Why ?

What happens to the dry raisins when we put them in plain water for sometime ? What happens if these raisins are now placed in, concentrated solution?

Why do bubbles appear in water when we heat it ?

Collect water samples from a pond, well, bore well.Keep then separately. Put a drop of water on a slide. Keep a cover-slip, on it. Observe. under the microscope. Which water contains larger number of microorganisms? Why?

Collect water samples from a pond, well, bore well.Keep then separately. Put a drop of water on a slide. Keep a cover-slip, on it. Observe. under the microscope. Do all water samples have the same type of microorganisms?

Take some water in a wide mouthed bowl. Put an iron nail in it. What do you observe ? Put an empty iron tin in that bowl. What do you observe ?Also try to observe whether a wooden piece floats on water. What happens when a wooden bowl is dipped in water ? what is your conclusion from the above activity?

If we add some table salt to water taken in a glass tumbler and stir with a spoon, we find no salt after sometime. Does the level of water change ? If not, why not ?

How do you count the following observations? a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why ? Write balanced redox equation for the reaction. b) When concentrated sulphuric acid is added to inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why ?

Find the correct order of the experiment regarding chromatography pour some water in a place Take a whole stick of white chalk Observe the colour pattern formed on chalk Put an ink mark on the surface of chalk Chalk is placed in water

Ink is a mixture of a dye in water. We can separate the components In the Ink using evaporation. The correct observation In the experiment is i) Water is separated in the form of vapour. ii) Dye component doesn't evaporate. Iii) Water and dye components gets evaporated . iv) Dye compounds gets sublimated