The addition of metals like $Cr,\,Mn,\,W$ and $Ni$ to ordinary steel makes it
More useful
Alters the properties of ordinary steel
Both $ (a)$ and $ (b)$
None of these
Coloured salts are formed by
The colour of copper sulphide is
In the following members of transition elements, the lowest ionization energy is of
The magnetic moments of following,arranged in decreasing order will be :-
$(i)$ $Co^{3+}$ (Octahedral complex with a strong field ligand)
$(ii)$ $Co^{3+}$ (Octahedral complex with a weak field ligand like $F^-$ )
$(iii)$ $Co^{2+}$ (Tetrahedral complex)
$(iv)$ $Co^{2+}$ (Square planar complex)
$(a)$ Transition metals can act as catalysts because these can change their oxidation state. How does $Fe(III)$ catalyse the reaction between iodide and persulphate ions ?
$(b)$ Mention any three processes where transition metals act as catalysts.