Chemistry Sodium vapour lamps glow with yellow colour. This is due to The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum Its ability to absorb all other colours except yellow sublimation of sodium to emit yellow colour The low ionisation energy of sodium The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum Its ability to absorb all other colours except yellow sublimation of sodium to emit yellow colour The low ionisation energy of sodium ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following was used as a chemical weapon in the first world war ? Hydrogen cyanide Carbon monoxide Water gas Mustard gas Hydrogen cyanide Carbon monoxide Water gas Mustard gas ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following group of gases contributes to the 'Green House Effect'? Carbon dioxide and Methane Carbon monoxide and Sulphur dioxide Ammonia and Ozone Carbon tetraflouride and Nitrous oxide Carbon dioxide and Methane Carbon monoxide and Sulphur dioxide Ammonia and Ozone Carbon tetraflouride and Nitrous oxide ANSWER DOWNLOAD EXAMIANS APP
Chemistry The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of an oxidation reaction a condensation reaction an addition reaction an elimination reaction an oxidation reaction a condensation reaction an addition reaction an elimination reaction ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following metals is used to galvanise iron ? Copper Mercury Lead Zinc Copper Mercury Lead Zinc ANSWER DOWNLOAD EXAMIANS APP
Chemistry The amount of chlorine available in water after disinfection is called as Free available chlorine Free chlorine Residual chlorine Combined available chlorine Free available chlorine Free chlorine Residual chlorine Combined available chlorine ANSWER DOWNLOAD EXAMIANS APP
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