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  1. In the final answer of the expression (29.2 – 20.2) (1.79 x 10⁵) / 1.37. The number
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  3. The normality of solution containing 31.5g of hydrated oxalic acid (H₂C₂O₄.2H₂O)
  4. In the electrolytic refining of zinc
  5. If the pH of a solution is 4, then its OH⁻ concentration is