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  1. The oxidation number of nitrogen in (N₂H₅)⁺ is
  2. Gram molecular volume of oxygen at STP is
  3. How many moles of lead (II) chloride will be formed from a reaction between
  4. pH value of a solution, whose hydronium ion concentration is 6.2 x 10⁻⁹ mol/L is
  5. Which one of the following elements has the maximum electron affinity?