Which is not true for transition elements

  • A

    They are all metals

  • B

    They show variable valency

  • C

    They form coloured ions

  • D

    They do not form co-ordinate compounds

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Which of the following ions will exhibit colour in aqueous solutions?

  • [AIPMT 2010]

Electrons in a paramagnetic compound are

Amongst  $Ti{F_6}^{2 - }\,,\,Co{F_6}^{3 - }\,,\,C{u_2}C{l_2}$ and $NiCl_4^{2-}$ the colourless species are 

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]

Transition element makes complex compound due to