A transition metal ion exists in its highest oxidation state. It is expected to behave as :
a chelating agent
a central metal in a coordination compound
an oxidising agent
a reducing agent
The highest magneticmoment is shown by the transition metal ion with the configuration :
3d2
3d5
3d7
3d9
In the periodic table metals usually used as catalysts belong to
f-block
d-block
p-block
s-block
Which of the following has the maximum number of unpaired 'd' electrons?
Zn2+
Fe2+
Ni3+
Cu+
B.
Fe2+
Zn (30) =[Ar] 3d10, 4s2
Zn2+=[Ar] 3d10 (no unpaired electron)
Fe(26) = [Ar] 3d6, 4s2
Fe2+= [Ar] 3d6 (four unpaired d electrons)
Ni (28) = [Ar] 3d8, 4s2
Ni3+= [Ar] 3d7 (three unpaired d electrons)
Cu (29) = [Ar] 3d10, 4s1
Cu+= [Ar] 3d10 (no unpaired electron)
An element with atomic number 21 is a
halogen
representative element
transition element
alkali metal
Mercury is a liquid metal because
it has a completely filled s orbital
it has a small atomic size
it has a completely filled d orbital that prevents d-d overlapping of orbitals
it has a completely filled d orbital that causes d-d overlapping
In chromite ore, the oxidation number of iron, and chromium are respectively
+3,+2
+3,+6
+2,+6
+2,+3
In chromite ore, the oxidation number of iron and chromium are respectively
+3, +2
+3, +6
+2, +6
+2, +3