List of top Chemistry Questions on Classification of elements and periodicity in properties asked in AIEEE

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I, having atomic number 9, 17, 35 and 53 respectively, is:

Which of the following oxides is amphoteric in character ?

Which one of the following ion has the highest value of ionic radius ?

Among $ {Al_2O_3, SiO_2, P_2O_3}$ and $ {SO_2}$ the correct order of acidic strength is

The formation of the oxide ion $O^{2-}(g)$ requires first an exothermic and then an endothermic step as shown below $O\left(g\right) + e^{-}O^{-} \left(g\right)?H^{\circ} = -142kJmol^{-1}$ $O^{-} \left(g\right) + e^{-}O^{2-} \left(g\right)?H^{\circ} = 844kJmol^{-1}$

Which one of the following is an amphoteric oxide?

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^+, Ca^{2+}, Mg^{2+}, Be^{2+}$