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  1. Na⁺, Mg²⁺, Al³⁺ and Si⁴⁺ are isoelectronic. The order of their ionic size is
  2. NO₂ is not obtained on heating
  3. Ozone is formed in the upper atmosphere from oxygen by the action of
  4. Which one of the following explains light both as stream of particle and as wave
  5. Urea reacts with nitrous acid to give