Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because _________. 
(i) The reaction is endothermic and requires very high temperatures. 
(ii) The reaction can be initiated only in presence of a catalyst. 
(iii) Oxides of nitrogen are unstable. 
(iv) N₂ and O₂ are unreactive. 

–I effect ∝ Acidic strength

+I effect ∝ Basic strength

*  Most stable anion due to maximum –I effect.

*  Most acidic

with increase in separation of screen from slits plane, fringe width increases.

Excessive nitrate in drinking water causes methemoglobinemia

Excessive nitrate in drinking water causes methemoglobinemia

Release of toxic/undesirable materials in the environment.