Chemistry In upper layer of atmosphere ozone is formed by The action of ultraviolet rays on oxygen The action of nitrogen on oxygen in atmosphere Subjecting oxygen to high pressure The combination of oxygen molecules The action of ultraviolet rays on oxygen The action of nitrogen on oxygen in atmosphere Subjecting oxygen to high pressure The combination of oxygen molecules ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following elements is found in all organic compounds Oxygen Nitrogen Calcium Carbon Oxygen Nitrogen Calcium Carbon ANSWER DOWNLOAD EXAMIANS APP
Chemistry The noble gas used in radiotherapy is Neon Argon Xenon Radon Neon Argon Xenon Radon ANSWER DOWNLOAD EXAMIANS APP
Chemistry Conduction band electrons have more mobility than holes because they Have negative charge Are lighter Experience collision less frequently Need less energy to move them Have negative charge Are lighter Experience collision less frequently Need less energy to move them ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following fibres catches fire least ? Rayon Nylon Cotton Terricot Rayon Nylon Cotton Terricot ANSWER DOWNLOAD EXAMIANS APP
Chemistry The maximum number of covalent formed by nitrogen is 3 2 1 4 3 2 1 4 ANSWER DOWNLOAD EXAMIANS APP
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