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  1. The volume of water to be added to N/2 HCl to prepare 500 cm³ of N/10 solution is
  2. Reaction of a carbonyl compound with one of the following reagents involves
  3. Oxidation number of chromium in Na₂Cr₂O₇ is
  4. 6.4 g SO₂ at 0⁰C and 0.99 atm pressure occupies a volume of 2.24 L
  5. A sp³ – hybrid orbital contains