Chemistry Which one of the following metals pollutes the air of a city having large number of automobiles? Chromium Cadmium Lead Copper Chromium Cadmium Lead Copper ANSWER DOWNLOAD EXAMIANS APP
Chemistry The pollutant responsible for ozone holes is ________ SO2 CO CFC CO2 SO2 CO CFC CO2 ANSWER DOWNLOAD EXAMIANS APP
Chemistry Where does the oxygen that keeps us alive come from? Carbonates absorbed from soil Water Carbon dioxide Oxides of minerals Carbonates absorbed from soil Water Carbon dioxide Oxides of minerals ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which of the following is not a method of preparing oxygen? Decomposition of potassium permanganate Electrolysis of water Decomposition of manganese dioxide Fractional distillation of liquid air Decomposition of potassium permanganate Electrolysis of water Decomposition of manganese dioxide Fractional distillation of liquid air ANSWER DOWNLOAD EXAMIANS APP
Chemistry All isotopes of the same element have ________ Different atomic numbers and different atomic mass Different atomic numbers and the same atomic mass The same atomic number and the atomic mass The same atomic number but different atomic masses Different atomic numbers and different atomic mass Different atomic numbers and the same atomic mass The same atomic number and the atomic mass The same atomic number but different atomic masses ANSWER DOWNLOAD EXAMIANS APP
Chemistry Mixture can be Heterogeneous Homogeneous Both A and B Pure substance Heterogeneous Homogeneous Both A and B Pure substance ANSWER DOWNLOAD EXAMIANS APP
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