  We show a hitherto unexplored consequence of the property of identicity in
quantum mechanics. If two identical objects, distinguished by a dynamical
variable A, are in certain entangled states of another dynamical variable B,
then, for such states, they are also entangled in variable A when distinguished
from each other by variable B. This dualism is independent of quantum
statistics. Departures from identicity of the objects due to arbitrarily small
differences in their innate attributes destroy this dualism. A system
independent scheme to test the dualism is formulated which is readily
realizable with photons. This scheme can be performed without requiring the
entangled objects to be brought together. Thus whether two macro-systems behave
as quantum identical objects can be probed without the complications of
scattering. Such a study would complement the program of testing the validity
of quantum superposition principle in the macro-domain which has stimulated
considerable experimentation.
