P Block Elements

In reaction ;

  $5F{e}^{2+}+Mn{O}_4^{-}+8H^{+}\to M{n}^{2+}+4H_{2}O+5F{e}^{3+}$              

Colour of Fe²⁺ is green and that of Fe³⁺ is yellow.

$I_3^{-}$ anion has three lone pair

BOD is biological oxygen demand which represents the amount of oxygen required to degrade organic matter in water.

Higher the BOD more polluted the water is

So; here water sample with BOD = 3 ppm is the cleanest

O₂F₂ oxidises plutonium to PuF₆ and the reaction is used in removing plutonium as PuF₆ from spent nuclear fuel.

When red phosphorus is heated in a sealed tube at 803 K, a - black phosphorus is formed.

(1) $N{a}^2{O}_2+2H_{2}O\to 2NaOH+H_2{O}_2$  

(2)  $Ba{O}_2.8H_{2}Ogives{H}_2{O}_2$ after evaporation

(3) PbO₂ + 2H₂O ->Pb (OH)₄

(4) SnO₂ + 2H₂O ->Sn (OH)₄

Type of back bonding:-

Therefore order of back bonding strength =>

BF₃ > BCl₃ > BBr₃ > Bl₃

the lowest spin only magnetic moment for Ni⁺² because of minimum unpaired electron.