Question
What are ambident nucleophilies? Explain with an example.
, i.e., linking through carbon atom resulting in alkyl cyanides and through nitrogen atom leading to isocyanides. Similarly nitrite ion also represents an ambident nucleophile with two different points of linkage 
. The linkage through oxygen results in alkyl nitrites while through nitrogen atom, it leads to nitroalkanes.
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(ii) Chromates change their colour when kept in an acidic solution.
(iii) $Zn , Cd , Hg$ are considered as $d$-block elements but not as transition elements.
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