At least how many types of organisms inhabit the earth? The measure of the variety of organisms present in different ecosystems is called what? How many types of plants are known to biologists? Biological classification is a method by which whom divide orgnisms into groups and subgroups? Nitrogen is a member of group VA in the periodic table? Pure Nitrogen is slightly heavier than air? Nitrogen is chemically inert at higher temperature? Haber process is used in the preparation of nitric acid? Sodium and potassium react with oxygen vigorously at ordinary temperature? In peroxides the valence number of oxygen is -1?
Hydrogen peroxide is stable at room temperature? Gain of electron by an atom or ion is called reduction? Ozone is a faintly blue gas? The atmosphere around us is divided into five layers? The layer of atmosphere in which we live is called stratosphere? Dry air contains about 21% of oxygen by volume? Nitric acid oxidizes sulphur dioxide to give sulphur tri-oxide? Removal of hydrogen from a compound is called reduction? On industrial scale nitric acid is obtained by the oxidation of ammonia? Carbon dioxide is produced when dilute nitric acid reacts with carbonates and bi-carbonates? Ozone is an allotropic form of sulpher?
Nitric acid reacts with hydrogen sulphide to give a suspension of sulphur? H2+Cl2 ------------------->2HCl is an example of Reducation reaction? The binary compounds of other elements with oxygen are called oxides? Nitric acid is prepared on industrial scale by the oxidation of? In amphoteric oxides the valence number of oxygen is? Chloro fluoro carbons carried by convection currents to the stratosphere? Nitrogen is obtained in laboratory by warming aqueous solution of?