GATE CY 2021 Question Paper (06-Feb-2021) (Shift 1)

The equilibrium constant for the reaction 3 NO (g) ⇌ N₂O (g) + NO₂ (g) at 25 °C is closest to: [ΔG° = −104.18 kJ; R = 8.314 J mol${}^{\text{₋₁}}$ K⁻¹ ]

The reaction of NiBr₂ with two equivalents of PPh₃ in CS₂ at –78 °C gives a red-coloured diamagnetic complex, [NiBr₂ (PPh₃)₂ ]. This transforms to a green-coloured paramagnetic complex with the same molecular formula at 25 °C. The geometry and the number of unpaired electrons in the green-coloured complex, respectively, are:

The rate of the substitution reaction of [Co(CN)₅Cl]${}^{3\text{–}}$ with OH${}^{\text{–}}$ to give [Co(CN)₅ (OH)]${}^{3\text{–}}$

The Δₒ of [Cr(H₂O)₆]³⁺, [CrF₆]${}^{3\text{–}}$ and [Cr(CN)₆]${}^{3\text{–}}$ follows the order:

The phase diagram of CO2 is shown below:



The correct statement(s) about CO2 is/are: