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  2. The pH of 0.001 N acetic acid solution, which is 10% dissociated, is
  3. The charge on the central metal ion in the complex[Ni(CO)₄] is
  4. A drug which is sturcturally related to adrenaline is
  5. When aniline is treated with sodium nitrite and hydrochloric acid at 0⁰C, it gives