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Standard XII
Chemistry
Haber Bosch Process
Question

The wrong statements about NH3 is :
  1. it gives black precipitate with calomel
  2. it can be dried by P2O5, H2SO4andCaCl2
  3. it is oxidised with oxygen at 700∘C in the presence of platinum
  4. it gives white fumes with HCI

A
it is oxidised with oxygen at 700∘C in the presence of platinum
B
it can be dried by P2O5, H2SO4andCaCl2
C
it gives black precipitate with calomel
D
it gives white fumes with HCI
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Solution
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NH3 is oxidised to nitric oxide and water with oxygen at 700oC in the presence of platinum.
Aqueous ammonia reacts with calomel Hg2Cl2 to produce metallic mercury, a black precipitate.
CaO calcium oxide is used for drying of ammonia. Because CaO being basic in nature does not react with NH3 while P2O5, conc. H2SO4 and CaCl2 reacts with it.
CaO+H2O+NH3→NH3+Ca(OH)2
CaCl2+8NH3→CaCl2.8NH3
P2O5+3H2O+6NH3→2(NH4)3PO4
H2SO4+NH3→(NH4)2SO4
NH3 gives White fumes of NH4Cl with HCl.

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