Complete the following reactions :

(i) NH₃ + 3Cl₂

(ii) XeF₆ + 2H₂O

OR

What happens when

(i) (NH₄)₂Cr₂O₇ is heated?

(ii) H₃PO₃ is heated?

Write the equations.

(i) NH₃ + 3Cl₂ (excess ) NCl₃+ 3HCl

Chlorine replaces hydrogen completely to form nitrogen trichloride which is an explosive and the remaining chlorine forms HCl.

(ii) XeF₆ + 2H₂O XeO₂F₂ + 4HF

Partial hydrolysis of XeF₆ gives oxyfluorides.

OR

(i) (NH₄)₂Cr₂O₇ N₂ + 4H₂O + Cr₂O₃

(ii) 4H₃PO₃ PH₃ + 3H₃PO₄

On heating, it undergoes disproportionation to form PH₃ and H₃PO₄ with +3 and +5 oxidation states respectively.