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  1. When excess ammonia is added to CuSO₄ solution the deep blue complex obtained is
  2. The pH value of blood does not appreciably change by a small addition
  3. In a metal oxide, there is 20% oxygen by weight. its equivalent weight is
  4. What is the approximate percentage of H₂O₂ in a sample labelled as 10 V?
  5. For the equilibrium, H₂O(l) ⇌ H₂O(g) at 1 atm and 298 K,