Q.The product obtained as a result of a reaction of nitrogen with CaC₂ is (NEET - Phase I)

Step 1. The genuine, well-documented industrial reaction between calcium carbide and nitrogen gas at high temperature (with a CaCl₂ catalyst, the Frank-Caro/nitrolim process) is CaC₂ + N₂ → CaCN₂ + C, producing calcium cyanamide (containing the linear N=C=N²⁻ cyanamide ion), used as a nitrogenous fertiliser.

Step 2. None of the four printed options (Ca(CN)₃, CaN₂, Ca(CN)₂, Ca₃N₂) is the formula CaCN₂ exactly. This looks like a printing/transcription defect in the option list rather than a genuine four-way choice, since the true answer is well established in the literature (and matches option (b) of the near-identical Q24 in this same evaluation set, 'CaNCN'). …

Recall the genuine Frank-Caro/nitrolim reaction (CaC₂ + N₂ → CaCN₂ + C) and compare it against the printed options; where no option matches exactly, identify the most likely int …

• Picking Ca₃N₂ (calcium nitride) by analogy with Mg₃N₂/Li₃N -- calcium nitride is what Ca METAL gives with N₂, not what calcium CARBIDE gives. …