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CTET TEST 1 (Cognitive Developement theory)
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IMPORTANT QUESTION ON METAL , AND METALLOIDS ( you want to know but don't know)
1) Most abundant metal in earth crust : aluminium. 2)2nd most abundant metal in earth crust : iron . 3) most abundant element in universe : hydrogen . 4) Most abundant element in human body: oxygen. 5) Most abundant mineral in human body : calcium . 6)Most abundant metalloids found in earth crust : silicon crust. 7) Rarest element in earth crust : Astatine. 8) Haviest metal in earth crust : Osmium . 9) Haviest element in earth crust : Uranium . 10) lightest metal in earth crust : Lithium . 11) Lightest element in earth crust : Lithium 12) hardest metal : platenum 13) Cobalt -60 is used to treatment of cancer . 14) Light emitted in firefly is due to burning of white phosphorous . 15) excess eating of chocolate is harmful due to Nickel & lead present in it .