A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be Copper Silver Aluminium Zinc TRUE ANSWER : ? YOUR ANSWER : ?
The two metal ions that cause hardness to water are: Calcium, Magnesium Sodium, Calcium Sodium, Potassium Sodium, Magnesium TRUE ANSWER : ? YOUR ANSWER : ?
Removal of carbon particles from air involves the principle of Sedimentation Electrophoresis Precipitation Filteration TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following has no unit Excitation potential Electronegativity Electron affinity Ionization energy TRUE ANSWER : ? YOUR ANSWER : ?
The compounds formed when hydrogen combines with p-block elements are called Ionic hydrides Polynuclear hydrides Metallic hydrides Molecular hydrides TRUE ANSWER : ? YOUR ANSWER : ?
The heaviest naturally occurring element is: Polonium Thorium Uranium Mercury TRUE ANSWER : ? YOUR ANSWER : ?
The non-metal found in the liquid state is Fluorine Bromine Chlorine Nitrogen TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is a man-made source of air pollution ? All of these Bacterial action in soil and swamp areas Automobile exhaust Forest fire TRUE ANSWER : ? YOUR ANSWER : ?