new delhi central board of secondary education cbse will conduct the class 12 chemistry examination for science stream students on today march 12 2019 revise textbookchemistry subject is one of the most scoring paper for class 12th students as per past trends most of the questions in the chemistry exam will be asked directly from the ncert textbook hence students are advised to revise important topics from the textbook reach exam hall on timeas per cbse instructions the students need to reach exam centre 1 hour before the exam time students will be given 15 minutes to read the question paper use these 15 minutes to decide which questions are easiest for you and attempt them first this will give you more time for tough and lengthy questions important topics you should revisefollowing are the important topics that students should revise before going to the exam on march 12 20191 atomic structure heisenberg principle quantum numbers electronic configuration2 ionic equilibrium salt hydrolysis buffer solution and solubility products3 chemical kinetics arrhenius equation and order of reaction4 electrochemistry electrolysis and conductance concentration cell5 gaseous and liquid state ideal gas equation vanderwaals constant kinetic gas theory diffusion6 general organic chemistry all topics7 amines exhaustive amination8 purification and characteristics of organic compounds separation and analysis of alcohols and phenols9 chemistry of representative elements silicon of oxides and oxyacids10 coordination chemistry and organo metallic compounds colour and magnetic properties hybridisation11 qualitative analysis ii and iv group analysis12 chemical energetic resonance energy and first law of thermodynamics13 hydrocarbons alkanes alkynes markovnikovs rules14 ethers breaking of ether linkage15 aldehydes and ketones aldol condensation nucleophilic addition16 carboxylic acid and its functional derivatives carboxylic acid17 chemical bonding mot hybridisation dipole moment