Chemistry The first metal used by man was iron gold copper bronze iron gold copper bronze ANSWER DOWNLOAD EXAMIANS APP
Chemistry The BOD values of water indicate the Amount of oxygen used for biochemical reduction Amount of oxygen used for biochemical oxidation Amount of ozone used for biochemical oxidation Amount of organic debris Amount of oxygen used for biochemical reduction Amount of oxygen used for biochemical oxidation Amount of ozone used for biochemical oxidation Amount of organic debris ANSWER DOWNLOAD EXAMIANS APP
Chemistry Ozone saves the biosphere by absorbing high energy radiations called ________ . Infra-red (IR) Ultraviolet rays (UV) X–rays Gamma rays Infra-red (IR) Ultraviolet rays (UV) X–rays Gamma rays ANSWER DOWNLOAD EXAMIANS APP
Chemistry The most important ore of lead is Pyrolusite Magnetite Galena Siderite Pyrolusite Magnetite Galena Siderite ANSWER DOWNLOAD EXAMIANS APP
Chemistry What is the principal ore of aluminium ? Copper Bauxite Dolomite Lignite Copper Bauxite Dolomite Lignite ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following metals pollutes the air of a city having large number of automobiles? Cadmium Copper Chromium Lead Cadmium Copper Chromium Lead ANSWER DOWNLOAD EXAMIANS APP
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