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  1. One litre hard water contains 12 mg Mg²⁺. Milli equivalents of washing soda
  2. The complex [Co(NH₃)₅Br]²⁺ SO₄²⁻ and [Co(NH₃)₅SO₄]⁺ Br⁻ are
  3. The solubility of CuBr is 2 ˣ 10⁻⁴ mol/L at 25⁰C. The Ksp value for CuBr is
  4. For a spontaneous process, entropy always
  5. If 2 g of aluminium is treated, first with excess of dilute H₂SO₄ and then