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  1. The oxidation states of S atoms in S₄O₆²⁻ from left to right respectively
  2. If Nₐ is Avagadro number then number of valence electrons in 4.2g of nitride
  3. Which of the following does not contain aluminium
  4. Why do calcium ions make water hard but sodium ions do not
  5. Pyrolusite is an ore of