The catalytic activity of the transition metals and their compounds is ascribed to their

  • A

    Chemical reactivity

  • B

    Magnetic behaviour

  • C

    Unfilled $d-$ orbitals

  • D

    Ability to adopt multiple oxidation states and their complexing ability

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The oxoanion in which the oxidation state of the central atom is same as its group number in the periodic table is

White silver surface turns black when $O_3$ is passed over it. This is due to the formation of

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Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy

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The element exhibiting most stable $ + \,2$ oxidation state among the following is

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Assertion : Cuprous ion $(Cu^+)$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.

Reason : Cuprous ion $(Cu^+)$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.

  • [AIIMS 2002]