Classification of Elements and Periodicity in Properties

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

Given below are two statements : Statement I : The second ionization enthalpy of B, Al and Ga is in the order of B > Al > Ga. Statement II : The correct order in terms of first ionization enthalpy is Si < Ge < Pb < Sn. In the light of the above statements, choose the correct answer from the options given below :

A monoatomic anion $(\mathrm{A^-})$ has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are

The 1$^{\text{st}}$ ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2$^{\text{nd}}$ ionization enthalpy of Mg is ______.

Given below are two statements: Statement I: The correct order of electronegativity of fluorine, oxygen and nitrogen is F > O > N. Statement II: The oxidation state of oxygen in $\mathrm{OF_2}$ is +2 and in $\mathrm{Na_2O}$ is $-2$. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements : Statement I : The number of pairs among $[\mathrm{Al_2O_3, Cr_2O_3}]$, $[\mathrm{Cl_2O_7, Mn_2O_7}]$, $[\mathrm{Na_2O, V_2O_3}]$ and $[\mathrm{CO, N_2O}]$ that contain oxides of same nature (acidic, basic, neutral or amphoteric) is 4. Statement II : Among $\mathrm{Na_2O}$, $\mathrm{Al_2O_3}$, CO and $\mathrm{Cl_2O_7}$, the most basic and acidic oxides are $\mathrm{Na_2O}$ and $\mathrm{Cl_2O_7}$, respectively. In the light of the above statements, choose the correct answer from the options given below :

First and second ionization enthalpies of lithium are 520 kJ mol$^{-1}$ and 7297 kJ mol$^{-1}$ respectively. Energy required to convert 3.5 mg lithium (g) into $\mathrm{Li^{2+}(g)}$ $[\mathrm{Li(g)\to Li^{2+}(g)}]$ is ________ kJ mol$^{-1}$. (nearest integer) [Molar mass of Li = 7 g mol$^{-1}$]

Match List - I with List - II. List - I (Electronic configuration of neutral atom (where n = 2)): A. $ns^2$; B. $ns^2np^1$; C. $ns^2np^3$; D. $ns^2np^6$. List - II (1$^{st}$ Ionization Energy (kJ mol$^{-1}$)): I. 2080; II. 899; III. 800; IV. 1402. Choose the correct answer from the options given below :

Match List-I with List-II. List-I: (A) $\mathrm{Al^{3+}<Mg^{2+}<Na^{+}<F^{-}}$ (B) B < C < O < N (C) B < Al < Mg < K (D) Si < P < S < Cl. List-II: (I) Ionisation Enthalpy (II) Metallic character (III) Electronegativity (IV) Ionic radii. Choose the correct answer from the options given below:

Which of the following electronegativity order is incorrect?