A pink coloured salt turns blue on heating. The presence of which cation is most likely ?

  • [JEE MAIN 2015]
  • A

    $Co^{2+}$

  • B

    $Cu^{2+}$

  • C

    $Zn^{2+}$

  • D

    $Fe^{2+}$

Similar Questions

For the following Assertion and Reason, the correct option is

Assertion : For hydrogenation reactions, the catalytic activity increases from Group $5$ to Group $11$ metals with maximum activity shown by Group $7-9$ elements.

Reason : The reactants are most strongly adsorbed on group $7-9 $ elements.

  • [JEE MAIN 2020]

Which of the following ions is coloured

Which element is alloyed with copper to form bronze

Many transition metals form interstitial compounds. The characteristics of these interstitial compounds are

$(I)$ They have high melting points, higher than those of pure metals

$(II)$ They are very hard

$(III)$ They retain metallic conductivity

$(IV)$ They are chemically more reactive than the pure metals

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