Chemistry Copper substances when exposed to air gains a green coating due to the formation of: CuCO3 Cu(OH)2 Cu(NO3)2 CuSO4 CuO CuCO3 Cu(OH)2 Cu(NO3)2 CuSO4 CuO ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ? Sulphur dioxide Nitrous oxide Carbon dioxide Chlorofluorocarbon Sulphur dioxide Nitrous oxide Carbon dioxide Chlorofluorocarbon ANSWER DOWNLOAD EXAMIANS APP
Chemistry The water pollution in river is measured by the dissolved amount of Nitrogen Ozone Chlorine Oxygen Nitrogen Ozone Chlorine Oxygen ANSWER DOWNLOAD EXAMIANS APP
Chemistry The most reactive among the halogens is Chlorine Bromine Fluorine Iodine Chlorine Bromine Fluorine Iodine ANSWER DOWNLOAD EXAMIANS APP
Chemistry The mass number of a nucleus is a fraction always more than the atomic weight always less than its atomic number the sum of the number of protons and neutrons present in the nucleus a fraction always more than the atomic weight always less than its atomic number the sum of the number of protons and neutrons present in the nucleus ANSWER DOWNLOAD EXAMIANS APP
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