Which one of the following is an amphoteric oxide?

  • A
    $V_2O_3$
  • B
    $CrO$
  • C
    $Cr_2O_3$
  • D
    $CrO_3$

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Which pair of elements from the following is used to make an alloy for trophies?

When potassium permanganate $(KMnO_4)$ is heated at $513 \ K$,it decomposes to form two manganese-based products. The physical properties of the product in which manganese has a higher oxidation state than the other are:

The pair of compounds in which both the metals are in the highest possible oxidation state is

The metal that does not give the borax bead test is

Fill in the blanks:
$1.$ Heating lanthanoids with sulfur gives .......
$2.$ Mixed oxides of lanthanoids are used as catalysts in ..........

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