202660 marks16 questions
7 of its 16 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.
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Source: JEE (Advanced) 2026, Paper 1, Chemistry, published by JEE (Advanced). The official PDF
An ideal gas (0.5 mol), initially at 2 bar pressure, is compressed at a constant temperature of 600 K in two steps: first, against a constant external pressure of P bar (2 < P < 8), and then against constant external pressure of 8 bar. At each step, the compression is stopped only when the pressure of the gas becomes equal to the external pressure. The total work done on the gas in these steps is W. Considering all possible values of P (2 < P < 8) and taking the gas constant as R (in J K⁻¹ mol⁻¹), the minimum value of |W| (in J) is
The correct order of dipole moments for the given species is
The 2s and the 2p orbital energies of hydrogen atom are E₂s(H) and E₂p(H), respectively. The 2s and the 2p orbital energies of lithium atom are E₂s(Li) and E₂p(Li), respectively. The correct option(s) about the orbital energies is(are)
Reaction of PtF₆ with oxygen (O₂) gas results in the formation of an ionic compound, X⁺Y⁻. Correct statement(s) is(are)
Two cylinders, both fitted with frictionless pistons, are filled with mixtures of He and Ar gases. In the first cylinder, the masses of He and Ar are m₁ and m₂, respectively. In the second cylinder, the masses of He and Ar are m₂ and m₁, respectively. The molar mass of Ar is 10 times the molar mass of He. The external pressure applied by the piston on the first cylinder needs to be 5 times that on the second cylinder so that the volume of the gas mixtures in both the cylinders are equal at the same temperature. Assuming He and Ar behave like ideal gases, the value of (m₁/m₂) is _____.
The total number of all possible isomers for the square planar complex with formula K[M(NCS)(NO₂)(gly)] is ____. (M = metal ion and gly = NH₂CH₂COO⁻)
Treatment of buta-1,3-diyne with NaNH₂ (2 equivalents), followed by reaction with excess of trans-CH₃-CH=CH-CH₂-Br gives X as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in X is ____.