The common impurity present in bauxite is

  • A
    $CuO$
  • B
    $ZnO$
  • C
    $Fe_{2}O_{3}$
  • D
    $Cr_{2}O_{3}$

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Which of the following pairs of metal and its ore is incorrect?

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

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Match the ores (Column $A$) with the metals (Column $B$):
Column $A$: Ores Column $B$: Metals
$I$. Siderite $a$. Zinc
$II$. Kaolinite $b$. Copper
$III$. Malachite $c$. Iron
$IV$. Calamine $d$. Aluminium

What percentage of the Earth's crust by mass is composed of oxygen (in $\%$)?

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