The d- and f- B...

What would happen when a solution of potassium chromate is treated with an excess of dilute nitric acid?

In $${Cr_{2}O_{7}}^{2-}$$ ion, the maximum number of bonds having the same Cr - O bond length is :

Which of the following pairs has almost same colour?

The increasing order of paramagnetism of the following compound is:

(I)$$MnSO_{4}.4H_{2}O  $$

(II)$$FeSO_{4}.7H_{2}O $$

(III)$$   NiSO_{4}.6H_{2}O$$

(IV)$$CuSO_{4}.5H_{2}O$$

Statements that are true of d-and f-block elements are:

1. The colour of $$K_{2}Cr_{2}O_{7}$$ is due to d-d transition.

2.  Actinides have larger number of oxidation states than lanthanides.

3.  Tripositive ions of $$Pr(At. No. =59)$$ and $$Tm(At. No. =69)$$ have the same (green) colour.

4.  Actinides have paramagnetic moments less than theoretically predicted values.

Regarding the magnetic properties of lanthanides and actinides the correct statement is:

The actinoids exhibit more number of oxidation states in general than lanthanoids because: 

Dipositive and tripositive ions of A and B possess same number of electron pairs, but different number of unpaired electrons. Both are paramagnetic. Identify the atomic numbers of A and B.

Atoms of the transition element are smaller than those of the s-block elements. This is because of  :

The value of the magnetic moment of a particular ion is 2.83 Bohr magneton. The ion is :