The d- and f- B...

Atomic numbers of $$Cr$$ and $$Fe$$ are, respectively, $$24$$ and $$26$$. Which of the following is paramagnetic with spin of electron?

The d-electron configurations of $$Mn^{2+}, Fe^{2+}, Co^{3+}$$ and $$Ni^{2+}$$ are $$3d^5, 3d^6, 3d^6, 3d^8$$, respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior? 

The color of $$Cu^+$$ compounds is?

$$ K_2 [HgI_4] $$ detects the ion/group:

Yellow color solution of $$ FeCl_{3} $$ changew to light green when

For Ni and pt dofferent L.P. in KJ $$ mol^{-1} $$ are given below.
$$ \frac { (IP)_ 1+(IP)_ 2 }{ \overset { Ni }{ Pt } \quad \quad \quad \quad \overset { 2.49 }{ 2.60 }  }   \frac { (IP)_ 3+(IP)_ 4 }{ \overset { 8.80 }{ 6.70 }  } $$

In $$ Cr_2O_7^{-2} $$ every Cr is linked to :

The colorless spccits is:

Which of the following electronic configuration will be associated with the lowest magnetic moment?

Arrange the following ions in order of their magnetic moment:
(i) $$ V^{4+} $$
(ii) $$ Mn^{4+} $$
(iii) $$ Fe^{3+} $$
 (iv) $$ Ni^{2+} $$
 (Atomic number of V = 23, Mn = 25, Fe = 26, Ni = 28)