Chemistry The elements with atomic numbers 9, 17, 35, 53, 85 are all Noble gases Heavy metals Halogens Light metals Noble gases Heavy metals Halogens Light metals ANSWER DOWNLOAD EXAMIANS APP
Chemistry The depletion in Ozone layer is caused by ________ . Methane Carbon dioxide Nitrous oxide Chlorofluorocarbons Methane Carbon dioxide Nitrous oxide Chlorofluorocarbons ANSWER DOWNLOAD EXAMIANS APP
Chemistry Conduction band electrons have more mobility than holes because they Have negative charge Need less energy to move them Are lighter Experience collision less frequently Have negative charge Need less energy to move them Are lighter Experience collision less frequently ANSWER DOWNLOAD EXAMIANS APP
Chemistry The method that cannot be used for removing permanent hardness of water is adding sodium carbonate boiling adding caustic soda distillation adding sodium carbonate boiling adding caustic soda distillation ANSWER DOWNLOAD EXAMIANS APP
Chemistry Ultra purification of a metal is done by : Leaching Zone melting Smelting Slugging Leaching Zone melting Smelting Slugging ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following phenomenon is considered responsible for Global Warming? Dry farming Fire in coal mines Trade winds Greenhouse effect Dry farming Fire in coal mines Trade winds Greenhouse effect ANSWER DOWNLOAD EXAMIANS APP
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