Chemistry The first metal used by a man was Copper Brass Bronze Silver Copper Brass Bronze Silver ANSWER DOWNLOAD EXAMIANS APP
Chemistry Browning of paper in old books is caused by Collection of dust Oxidation of cellulose Lack of aeration Frequent use Collection of dust Oxidation of cellulose Lack of aeration Frequent use ANSWER DOWNLOAD EXAMIANS APP
Chemistry Synthetic detergents are prepared from Sodium salts of higher fattyacids Glycerides Hydrocarbons of petroleum Potassium salts of higher fatty-acids Sodium salts of higher fattyacids Glycerides Hydrocarbons of petroleum Potassium salts of higher fatty-acids ANSWER DOWNLOAD EXAMIANS APP
Chemistry The gas causing acid rain in an industrial area is Methane Carbon monoxide Sulphur dioxide Carbon dioxide Methane Carbon monoxide Sulphur dioxide Carbon dioxide ANSWER DOWNLOAD EXAMIANS APP
Chemistry The most abundant constituent of atmospheric air is : Oxygen Hydrogen Carbon Nitrogen Oxygen Hydrogen Carbon Nitrogen ANSWER DOWNLOAD EXAMIANS APP
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