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  1. Which of the following statements about H₃BO₃ is not correct
  2. For a thermodynamically reversible reaction in a galvanic cell at temperature T,
  3. Which of the following is not soluble in NaOH
  4. Ethyne can be oxidised to oxalic acid by using
  5. The molar fraction of nitrogen, in a mixture containing 70 grams nitrogen,