pls explain the circled ques

pls explain the circled ques J rngh. first ionisation potential (c) Large ionic radius o , use of its : second ionization potential 58. 60 61 6 63. 4. (d) High electronegativity Whi e following is different from other three oxides? go (b) sno the following compounds has a of solution? (b) LiC1 (c) LiBr Which of the following pairs of molecules have the ahnost identical bond dissociation energy? N2 and CO (c) Fa and 12 (d) HF and 02 Which of the follo g compounds has a of solution? (a) RCI (b). KBr Born-Haber cycle can be used to estimate : {d) Lattice energy of ionic crystals (b) Electron gain enthalpy "Both (a) and (b) (c) Elearonegativity According to modern periodic law the properties of elements repeat at regular intervals w the elements are arrånged in order of : (a) d asing atomic number increasing atomic number (b) increasing atomic weight (d) decreasing atomic weights r that has three 2p electrons : Give the symbol of the elements of lowest atomic (d) Si a) Mg 5. In the fourth period of the periodic table, how manye mentshaveoneormore4delectrons (b) 18

Dear Student

Question No. 58 -
Answer is MgO is a basic oxide while the other three, PbO, ZnO and SnO are amphoteric oxides.
Amphoteric oxides are those ion or molecule that can react both as an acid as well as a base. The property of amphoterism depends upon the oxidation state of the oxides. Copper, zinc, tin, lead, aluminium, etc., form amphoteric oxides.

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