The d- and f- B...

Which of the following is a correct statement?

Mark the correct statements(s):
1. Manganese coloured ions
2. Zinc forms coloured ions
3. $$[CoF_6]^{3-}$$ is diamagnetic
4. $$Sc$$ from $$+4$$ oxidation state
5. Zinc exhibits only $$+2$$ oxidation state

The catalysic activity of transition elements and their compounds is described to:

A transition metal $$A$$ has spin only magnetic moment value of $$1.8\ B.M$$. When it is reacted with dilute $$H_2SO_4$$ in presence of air, its compound $$B$$ reacts with compound $$C$$ to give compound $$D$$ with liberation of iodine. Then the metal $$A$$, and compounds $$B, C$$ and $$D$$ are respectively:

Wilkinson's catalyst is :

Among the following, the lowest degree of paramagnetism per mole of the compound will be shown by:

Arrange the following ions in their magnetic moment:
(i) $$V^{4+}$$
(ii) $$Mn^{4+}$$
(iii) $$Fe^{3+}$$
(iv) $$Ni^{2+}$$
[At. Nos. $$V=23, Mn=25, Fe=26, Ni=28$$]

In $$K_2Cr_2O_7$$, every $$Cr$$ is linked to:

In $$3d$$ series, the maximum magnetic moment is shown by:

Match the List $$I$$ with List $$II$$ and List $$III$$