Aluminium is the most abundant metal in the Earth's crust,yet it is primarily obtained from bauxite because:

  • A
    Bauxite is available in larger quantity
  • B
    It is easier to extract aluminium from it
  • C
    Bauxite contains the maximum percentage of aluminium
  • D
    Bauxite is less impure

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The oxidation state of copper is $ +1 $ in which of the following?

The ore in which sulphide is absent :
$(I)$ Cuprite
$(II)$ Argentite
$(III)$ Pyrites
$(IV)$ Siderite

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