IIT JEE Chemistry Effective atomic number rule or Sidgwick theory by NV sir

[@prakhargupta8934]

Best teacher really appreciable✨✨

[@chemostudy790]

Best teacher of chemistry

[@teamnsd8750]

Thanks sir

[@cse_27_tamojitghosh57]

you are best sir

[@vaiebhavpatil2340]

khatarnak sir maja aa gya

[@chemistryclassesbyjaychand7056]

Thanks sir