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JEE Advanced

2025 Paper 1 (English)

JEE Advanced Previous Year Question Papers — 2025 Paper 1 (English). Official question papers; reviewed questions and answers where available, with source attribution backed by validated provenance.

Paper details

Year
2025
Paper
Paper 1
Language
English

Validated source link: JEE Advanced archive (retrieved 2026-08-23).

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Question 1

The heating of NH4NO2 at 60-70 °C and NH4NO3 at 200-250 °C is associated with the formation of nitrogen containing compounds X and Y, respectively. X and Y, respectively, are

  1. N2 and N2O
  2. NH3 and NO2
  3. NO and N2O
  4. N2 and NH3
Official answer and source attribution

Answer: N2 and N2O

Official answer: option A. Source: JEE (Advanced) 2025 Paper 1, Q.1 (jeeadv.ac.in archive).

Question 2

The correct order of the wavelength maxima of the absorption band in the ultraviolet-visible region for the given complexes is

  1. [Co(CN)6]3- < [Co(NH3)6]3+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)5(Cl)]2+
  2. [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)6]3+ < [Co(CN)6]3-
  3. [Co(CN)6]3- < [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)6]3+
  4. [Co(NH3)6]3+ < [Co(CN)6]3- < [Co(NH3)5(Cl)]2+ < [Co(NH3)5(H2O)]3+
Official answer and source attribution

Answer: [Co(CN)6]3- < [Co(NH3)6]3+ < [Co(NH3)5(H2O)]3+ < [Co(NH3)5(Cl)]2+

Official answer: option A. Source: JEE (Advanced) 2025 Paper 1, Q.2 (jeeadv.ac.in archive).

Question 3

One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is

  1. I2
  2. IO3-
  3. IO4-
  4. IO2-
Official answer and source attribution

Answer: IO3-

Official answer: option B. Source: JEE (Advanced) 2025 Paper 1, Q.3 (jeeadv.ac.in archive).

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