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  1. Difference in density is the basis of
  2. A gas decolourised by KMnO₄ solution but gives no precipitate with ammoniacal cuprous
  3. ³⁵₁₇Cl and ³⁷₁₇Cl are two isotopes of chlorine. If average atomic weight is 35.5
  4. Phenolic carboxylic acids may be prepared by
  5. If Ksp for HgSO₄ is 6.4 x 10⁻⁵, then solubility of the salt is