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  1. Ethylene glycol reacts with excess of PCl₅ to give
  2. Which of the following is expected to form colourless complex
  3. The number of unpaired electrons in 1s² 2s² 2p³ is
  4. Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25 . Then fine out pKb of NH₄OH
  5. He₂ does not exist because its