Chemistry Conduction band electrons have more mobility than holes because they Need less energy to move them Have negative charge Experience collision less frequently Are lighter Need less energy to move them Have negative charge Experience collision less frequently Are lighter ANSWER DOWNLOAD EXAMIANS APP
Chemistry The mass number of a nucleus is always less than its atomic number a fraction the sum of the number of protons and neutrons present in the nucleus always more than the atomic weight always less than its atomic number a fraction the sum of the number of protons and neutrons present in the nucleus always more than the atomic weight ANSWER DOWNLOAD EXAMIANS APP
Chemistry Surface water is a better source of drinking water because it is poor in Algae Arsenic Dust Bacteria Algae Arsenic Dust Bacteria ANSWER DOWNLOAD EXAMIANS APP
Chemistry If water smells bad, then that odour can be removed by adding Activated carbon Bleach Alum Deactivated nitrogen Activated carbon Bleach Alum Deactivated nitrogen ANSWER DOWNLOAD EXAMIANS APP
Chemistry Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water Manganese Magnesium Calcium None of these Manganese Magnesium Calcium None of these ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following acids is used in battery ? Hydrochloric acid Sulphuric acid Hydrofluoric acid Sulphurous acid Hydrochloric acid Sulphuric acid Hydrofluoric acid Sulphurous acid ANSWER DOWNLOAD EXAMIANS APP
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