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  1. When excess ammonia is added to CuSO₄ solution the deep blue complex obtained is
  2. The hybridisation of carbon in diamond ,graphite and acetylene is in the order of
  3. In Duma’s method for estimation of nitrogen, 0.25g of an organic compound
  4. Wood charcoal is used to decolourise sugar because it
  5. A bromoalkane contains 35% carbon and 6.57% hydrogen by mass. Calculate the empirical