JEE Main 2026 — Chemistry Inorganic Chemistry

By usual analysis, 1.00 g of compound $(\mathrm{X})$ gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound $(X)$ is : (nearest integer) (Given, molar mass in $\mathrm{g} \mathrm{mol}^{-1}: \mathrm{O}=16, \mathrm{Mg}=24, \mathrm{P}=31$)

Among $Fe^{2+}, Fe^{3+}, Cr^{2+}$ and $Zn^{2+}$, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

Among $Fe^{3+}$, $Pb^{2+}$, $Cu^{2+}$ and $Mn^{2+}$, identify the one that gets precipitated out while passing $H_2S$ in presence of $NH_4OH$ as group reagent. The highest possible oxidation state of the corresponding metal is

Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A. $[\text{NiCl}_4]^{2-}$ $-$ sp$^3$, tetrahedral, paramagnetic B. $[\text{Ni(NH}_3)_6]^{2+}$ $-$ sp$^3$d$^2$, octahedral, paramagnetic C. $[\text{Ni(CO)}_4]$ $-$ sp$^3$, tetrahedral, paramagnetic D. $[\text{Ni(CN)}_4]^{2-}$ $-$ dsp$^2$, square planar, diamagnetic Choose the correct answer from the options given below :

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Electronic configuration of tetrahedral metal ion</th><th>List-II Crystal Field Stabilization Energy ($\Delta_t$)</th></tr><tr><td>A. $d^2$</td><td>I. $-0.6$</td></tr><tr><td>B. $d^4$</td><td>II. $-0.8$</td></tr><tr><td>C. $d^6$</td><td>III. $-1.2$</td></tr><tr><td>D. $d^8$</td><td>IV. $-0.4$</td></tr></tbody></table> Choose the correct answer from the options given below: