1) The modern periodic table was discovered by  a) Dmitri Mendeleev b) Henry Moseley  c) Johann Wolfgang Dobereiner  d) Newlands 2) There are _______ periods in Modern Periodic table  a) 18 b) 8 c) 7 d) 17 3) The minimum energy required to remove an electron from an isolated gaseous atom in its ground state to form a cation is known as  a) Ionisation energy b) Electron affinity c) Ionic radii d) Electronegativity 4) The Rocky impurity associated with an ore is called  a) Flux b) Slag c) Minerals d) Matrix 5) Rock salt (NaCl) is a  a) Carbonate ore b) Halide ore c) Oxide ore d) Sulphide ore 6) All the metals are solid at room tempeature except a) Gallium b) Zinc c) Sodium d) Tungsten e) Mercury f) Potassium 7) The chief ore of aluminum is  a) Cryolite b) Siderite c) Bauxite d) Fluorspar e) Corundum 8) The melting point of aluminum is a) 900°C b) 660°C c) 650°C d) 950°C 9) Copper is a _________ metal a) Silvery white b) Greyish white c) Reddish brown 10) Copper is used in a) Making aeroplanes b) Electroplating c) Construction of buildings d) Electromagnets 11) An alloy is a __________ mixture of two or more metals or of one or more metals with certain non- metallic elements a) Heterogeneous b) Homogeneous 12) Hydraulic method is also known as  a) Magnetic separation method b) Chemical method c) Gravity separation method d) Leaching 13) The corrosive action in the presence of moisture is called a) Wet corrosion b) Dry corrosion c) Chemical corrosiom 14) The process of coating zinc on iron sheets to prevent corrosion by using electric current is known as  a) Electroplating b) Catholic protection c) Anodizing d) Galvanization 15) Wrought iron  a) Iron with 2.0% - 4.5% of carbon b) Iron with < 0.25% of carbon  c) Iron with >0.25% of carbon d) Iron with 0.25% - 2.0% of carbon

Chemistry

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