Water is the best option for staying hydrated. Other drinks and foods can help you stay hydrated, but some may add extra calories from sugar to your diet. Drinks like fruit and vegetable juices, milk, and herbal teas can contribute to the amount of water you get each day.

Petrol floats on water and with the oxygen from the atmosphere, it keeps burning. Water is heavier than petrol and will just have the effect of spreading the fire.

Organic compound, any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen. Covalent compounds also are known as molecular compounds. Organic compounds, such as carbohydrates, lipids, proteins and nucleic acids, are all examples of molecular compounds. 
Hence, option is A correct.

• Fluorine is so electronegative that, for oxygen to bind, it must be a positively charged ion because oxygen is also a very electronegative atom, this won't happen.


• Therefore, it can form a single oxoacid, HOF which is fluoric(I) acid or hypofluorous acid. The other elements of the halogen family produce several oxoacids.

Mol² let^-2 is the unit of ionic product of water (Kw). Like the other equilibrium constant, the value of K_w varies with temperature.

The chemical behavior of atoms is determined by the number and the configuration of the electrons in the atom.The number of electrons in the valence shell because these are the electrons involved in making chemical bonds.

• Popular salts are sodium thiosulfate—commonly called hypo—and ammonium thiosulfate—commonly used in modern rapid fixer formulae.
• Fixation involves these chemical reactions (X = halide, typically Br⁻): AgX + 2 S₂O₃²⁻→ [Ag(S₂O₃)₂]³⁻ + X.

An orthopedic cast, body cast, plaster cast, or surgical cast, is a shell, frequently made from plaster, encasing a limb (or, in some cases, large portions of the body) to stabilize and hold anatomical structures, most often a broken bone (or bones), in place until healing is confirmed. It is similar in function to a splint. 
Plaster bandages consist of a cotton bandage that has been combined with plaster of paris, which hardens after it has been made wet. Plaster of Paris is calcinedgypsum (roasted gypsum), ground to a fine powder by milling. When water is added, the more soluble form of calcium sulfate returns to the relatively insoluble form, and heat is produced.

Bromine belongs to the halogen group. It is the only non-metal element that is in a liquied form at room temperature. At room temperature it is a reddish brown fuming liquid with unpleasant chlorine like smell.

Sodium metal reacts with water and is thus typically stored under mineral oil or kerosene