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  1. Concentrated sulphuric acid is always dilute by adding
  2. Germanium of very high purity is obtained by
  3. Primary,secondary and tertiary amines can be distinguished by
  4. If the ratio of the rates of diffusion of two gases A and B is 4 : 1. Then the ratio
  5. If the atomic number of an element is 33, it will be placed in the periodic table