Balancing of the chemical equation

What is a chemical reaction?|Characteristics of chemical reaction|Making chemical equation more informative |Balancing of chemical equation

Name the law which requires the balancing of chemical equation.

Balance the chemical equations: Pb_3 O_4 to PbO + O_2

Balance the chemical equations: NH_3 + O_2 to NO + H_2O

Rules For Balancing Of Chemical Equation|Balancing Of Chemical Equation|Balancing Of Chemical Equation In Acidic Medium|Balancing Of Chemical Equation In Basic Medium|Balancing Of Chemical Equation By ABCD Method|OMR

Why is it necessary to balance a chemical equation ? Outline briefly the various steps for balancing a chemical equation by hit and trial method.

Balancing Of Chemical Equation|Types Of Chemical Reaction|OMR