MHT CET Medical202622 April 2026Evening ShiftChemistryRedox ReactionsActual
The oxidation number of nitrogen in ammonia ( NH ₃ ) is:
Options
- A+3
- B-3
- C+5
- D-5
Correct answer
B. -3
Step-by-step solution
Let the oxidation number of nitrogen in NH ₃ be x . Hydrogen is bonded to a more electronegative element, so its oxidation state is +1 . The sum of oxidation numbers in a neutral molecule is zero. x + 3(+1) = 0 x + 3 = 0 x = -3 The oxidation number of nitrogen in ammonia is -3 . Answer: -3