Chemastro

  CSIR UGC-NET EXAM DECEMBER 2025 PDF          National testing agency(NTA) will be conducting the joint CSIR UGC-NET Exam 2025 on the month of December for the award of JUNIOR RESEARCH FELLOW and appoinment as ASSISTANT PROFESSOR appoinment as ASSISTANT PROFESSOR and admission to ph.D and admission to PhD only through Computer mode of examination(CBT). The schedule details are given below: Online submission details  From 25 Sept 2025 to 24 Oct 2025 Date of Exam 18 December 2025 Duration of exam 3 hours (180 mins) On shift basis 09:00 AM to 12:00pm 03:00 PM TO 06:00PM Medium of exam English and Hindi Website https://csirnet.nta.nic.in/ Information bulletin link https://examinationservices.nic.in/ExamSys2026/root/Home.aspx?enc=Ei4cajBkK1gZSfgr53ImFTqGsyg38PlGNCGSuvSzsiV1qebCK8HwyoyshndJPRez https://www.revenuecpmgate.com/ttk78pwf92?key=267bf0257473f0128ce906f40f429fa9        Candidates who wish to apply may go through the i...

10 pyqs with solutions for scientific assistant for chemistry  1. Which of the following is an example of a lewis acid? 1. HCL 2. H2SO4 3. AlCl3 4. NaOH Answer: AlCl3  Explanation: Since lewis acid is a electron acceptor comparing to all other options AlCl3 only accepts electrons. 2.   Which of the following is most  acidic? 1. O- nitrophenol 2. Phenol 3. O- cresol  4. m-cresol Answer: O-nitrophenol Explanation: Since the nitro group is EWG, the proton in the OH group can easily leaves making it acidic 3.   Which of the following   properties increases from left         to right across a period in the periodic table? 1. Atomic radii 2. Ionization enthalpy  3. Atomic mass 4. Metallic conductivity    Answer: Ionization enthalpy   Explanation: Since moving   from left to right across    period the electrons can be pulled more towards the nucleus leading to inc...