Practice MCQ Questions and answers on Chemistry-GK

Chemical name of common salt is Sodium Chloride.

Nitrogen forms a variety of compounds in all oxidation states ranging from –3 to +5.

Covalency is the number of covalent bond of an element or compounds. So nitrogen have 3 covalent bond and 1 co ordinate bond. So covalency of nitrogen is 3.

Magnesium hydroxide is the inorganic compound with the chemical formula Mg(OH)₂. It occurs in nature as the mineral brucite. It is a white solid with low solubility in water. Magnesium hydroxide is a common component of antacids, such as milk of magnesia, as well as laxatives.

In analytical chemistry, a trace element or microelement is an element in a sample that has an average concentration of less than 100 parts per million measured in atomic count or less than 100 micrograms per gram. These are those elements essential for plant growth which are needed in only very small (micro). They are: boron (B), copper (Cu), iron (Fe), chloride (Cl), manganese (Mn), molybdenum (Mo) and zinc (Zn).

Calcium hypochlorite is an inorganic compound with formula CaO(Cl)₂. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent.

Nitrous oxide(N₂o) is a colourless, sweet-tasting gas. It is also known as "laughing gas".

Sodium hydroxide is also known as lye or soda , or caustic soda. At room temperature, sodium hydroxide is a white crystalline odorless solid that absorbs moisture from the air.

The compound zinc oxide (ZnO) is called philosopher's wool. Alchemists, as part of their rituals, would burn zinc in air and collect the residue, which formed into white woolly tufts. They called it lana philosophica in Latin, meaning philosopher's wool.

The atomic number of oxygen is 8.