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When concentrated H subscript 2 end subscript S O subscript 4 end subscript is added to dry K N O subscript 3 end subscript, brown fumes evolve. These fumes are

  1. S O subscript 2 end subscript    
  2. S O subscript 3 end subscript    
  3. N O    
  4. N O subscript 2 end subscript    

The correct answer is: N O subscript 2 end subscript


    2 K N O subscript 3 end subscript plus H subscript 2 end subscript S O subscript 4 end subscript rightwards arrow 2 K H S O subscript 4 end subscript plus stack 2   N O subscript 2 end subscript upwards arrow with left parenthesis text Brown gas end text right parenthesis below

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