Answer:
Chelates are cyclic compounds so
they are more stable than normal complexes. In chelates ligands are held by two
or more bonds with the transition metals, e.g.,
or
(i) Hardness of
water is estimated by titration with 
.
(ii) DMG is
used for the detection and estimation of nickel.
(iii) 
nitroso 
naphthol
is used for the detection and estimation of cobalt.
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