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                                    Qutb Minar was used as a minaret...(1) to vigil on invaders (2) to summon Muslims for prayers (3) to speech by the rulers (4) none of these | 
                            
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Answer»  is a chemical ELEMENT with the symbol Co and atomic NUMBER 27. Like nickel, cobalt is found in the EARTH's CRUST only in a chemically combined form, save for small deposits found in ALLOYS of natural meteoric iron.  | 
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