Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

Mention two important uses of heavy water.

Give reasons. Water is not used to control fires involving electrical equipment.

Why are majority of plant nutrient elements are called mineral nutrients?

Why are vitamin A and vitamin C essential to us? Give their important sources.

Science, like any knowledge, can put to good or bad use, depending on the user. Given below are some of the applications of science. Formulate your views on whether the particular applicatioa is good, bad -orsomething that cannot be so clearly, categorized : (a) Mass vaccination against small pox to curb and finally eradicate this disease from the population. (This has already been successfully done in India). Television for eradiction of illeteracy and for mass communication of news and ideas. Prenatal sex determination Computers for increase in work efficiency.. . Puttiing artificial satellites into orbits around the Earth. Development of nuclear weapons. Development of new and powerful technique of chemical and biologicaal warfaree. Purificaitoin of water for drinking. plastiic Surgery and cloning.

Why is the use of iodised salt advisable?

Give reasons for the following Rusting of iron is quicker in saline water than in ordinary water. Why is it so?

Sodium bisulphite is used for the purification of aldehydes and Ketones. Why?

Why is it necessary to use a salt bridge in a galvanic cell?