Chemistry The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is oxygen ozone helium methane oxygen ozone helium methane ANSWER DOWNLOAD EXAMIANS APP
Chemistry In chemical terms, what are alums used for purifying water for drinking purposes ? Hydrated chlorides Nitrates of aluminium Double sulphates Double nitrate Hydrated chlorides Nitrates of aluminium Double sulphates Double nitrate ANSWER DOWNLOAD EXAMIANS APP
Chemistry The mineral containing both magnesium and calcium is carnallite dolomite magnesite calcite carnallite dolomite magnesite calcite ANSWER DOWNLOAD EXAMIANS APP
Chemistry The quality of petrol is expressed in terms of Gold number Cetane number Added unlead compounds Octane number Gold number Cetane number Added unlead compounds Octane number ANSWER DOWNLOAD EXAMIANS APP
Chemistry The smog is essentially caused by the presence of Oxides of N and S O2 and N2 O3 and N2 O2 and O3 Oxides of N and S O2 and N2 O3 and N2 O2 and O3 ANSWER DOWNLOAD EXAMIANS APP
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