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JEE Advanced2011Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Extra pure N ₂ can be obtained by heating

Options

  1. ANH ₃ with CuO
  2. BNH ₄ NO ₄
  3. C( NH ₄ )₂ Cr ₂ O ₇
  4. DBa ( N ₃ )₂

Correct answer

D. Ba ( N ₃ )₂

Step-by-step solution

Ba ( N ₃ )₂ Heat Ba ( s )+3 ~N ₂( ~g ) Azide salt of barium can be obtained in purest form as well as the decomposition product contain solid Ba as byproduct along with gaseous nitrogen, hence no additional step of separation is required. Other reactions are:

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