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# Computer Science and PCM Enthusiasts − Q & A

 57 Users in the Group Moderator: Sdfg Sdfg +Join ProfileTimelineQ & A

 ```Guys plz check whether this question is wrong or not :- In H atom the energy of electron in the nth orbit is given as En = -13.6/n². Show that E(n+1) - En = -13.6/n² eV*2 for large value of n. #By large value of n ---> you can consider n+1 ~ n``` asked by Richeek Das (hamba) 5 days ago 0
 ```(Originally asked on ICSE Q&A by Vineet Kothari (vineet_kothari) ). 1 mole mixture of N2,NO2,N2O4 has a mean molar mass 55.4 on heating to temprature at which all hte N2O4 dissociate into NO2 according to raction (N2O4 double headed arrow 2NO2) and average molar mass becomes 39.6.what is the mole ratio of N2,NO2,N2O4 ????? [ANSWER:0.5:0.1:0.4]``` asked by Loney (subhramit) 5 days ago 0
 ```guys....here's the link to the NTSE Stage 2 2017 question paper. Solve maths, it was really good. https://www.resonance.ac.in/answer-key-solutions/NTSE/2017/Stage-2/AnswerKey/SAT-Paper.pdf WARNING: The link address is misleading. u might think that its the answer key, but its not.. Cheers!!``` asked by Sam307 (saksham307) 8 days ago 1
 `What is Ss7 module and how can I download it` asked by Daniel hughes (safi444) 16 days ago 1
 `How to eat hydra` asked by Funny Funny (funnysimgh) 16 days ago 3
 ```So this group is for CS? Does anyone know about p vs np?``` asked by Catlover (catlover) 17 days ago 0
 `Awesome... Let's make this group a success.` asked by Krishanu Dutta (krishanudutta) 17 days ago 1