#Nios12th_class_Chemistry ke questions solve kre (log and anti-log): https://www.youtube.com/playlist?list=PL7DTmqhU89maSJdOcVpyjZOH476HhXszV
#NIOS12th class chapter-2 Atomic structure: https://www.youtube.com/playlist?list=PL7DTmqhU89mYbXki9ruL4PjV2pq_TAiKW