Free NEET Chemistry multiple-choice questions on Electronegativity & Valency. Attempt each question and reveal the answer with a full explanation.
The Pauling electronegativity value for Hydrogen is: 2.1 1.0 3.0 4.0 The tendency of an atom in a molecule to attract shared electrons is called: Electronegativity Electron gain enthalpy Ionization enthalpy Polarizability Which of the following elements can exhibit the highest oxidation state of +8 in its compounds? Osmium Manganese Chromium Iron Which of the following is an amphoteric oxide? ZnO CO 2 CaO SO 2 The maximum covalency shown by Boron in the formation of the complex ion [BF 4] - is: 4 3 6 2 Which of the following factors is most significant in making Fluorine the most electronegative element? High nuclear charge and very small atomic size. The presence of vacant d-orbitals. High electron gain enthalpy. Low ionization enthalpy. Arrange the following elements in increasing order of electronegativity: N, O, F, C, Si Choose the correct answer from the options given below: Si < C < N < O < F Si < C < O < N < F O < F < N < C < Si F < O < N < C < Si Which of the following is the correct order of increasing field strength of the ligands to form coordination compounds? (Considering periodic trends and CFSE) SCN - < F - < C 2O 4 2- < CN - SCN - < C 2O 4 2- < F - < CN - F - < SCN - < C 2O 4 2- < CN - CN - < C 2O 4 2- < SCN - < F - Which property of elements shows a diagonal relationship between Be and Al ? Amphoteric nature of their oxides High melting points Paramagnetic behavior High electrical conductivity According to the Mulliken scale, electronegativity is defined as: Ionization Potential + Electron Affinity 2 Ionization Potential - Electron Affinity 2 0.359 Z eff r 2 + 0.744 The power of an atom to attract electrons Regarding electronegativity, which of the following statements is correct? Electronegativity of sp hybridized carbon is higher than sp 2 . Electronegativity increases down the group. Electronegativity is a measurable quantity like ionization enthalpy. Cesium has the highest electronegativity. The Pauling electronegativity value for Fluorine is defined as 4.0. What is the value for Cesium? 0.7 1.0 1.2 0.5 Which of the following is the most acidic oxide? Cl 2O 7 P 4O 10 SO 3 Al 2O 3 In which of the following pairs, the stability of the lower oxidation state increases down the group due to the 'Inert Pair Effect'? Pb 2+ > Pb 4+ C 2+ > C 4+ Si 2+ > Si 4+ Ge 2+ > Ge 4+ What is the oxidation state of Oxygen in the compound F 2O ? +2 -2 -1 +1 Among the following, which oxide is the most acidic? Cl 2O 7 P 4O 10 SO 3 Al 2O 3 The value of electronegativity on the Pauling scale for an atom is related to the hybridization of that atom. Which of the following is correct? sp > sp 2 > sp 3 sp 3 > sp 2 > sp sp 2 > sp > sp 3 sp 2 > sp 3 > sp Which of the following oxides is most basic in nature? Bi 2O 3 P 4O 10 As 2O 3 Sb 2O 3 The correct order of metallic character for the elements Na, Mg, Be, Si and P is: Na > Mg > Be > Si > P Be > Na > Mg > Si > P Na > Be > Mg > Si > P P > Si > Be > Mg > Na The correct order of increasing acidic strength of the following oxides is: Cl 2O 7 > SO 3 > P 4O 10 > SiO 2 SiO 2 > P 4O 10 > SO 3 > Cl 2O 7 SO 3 > Cl 2O 7 > P 4O 10 > SiO 2 P 4O 10 > SO 3 > Cl 2O 7 > SiO 2 The electronegativity of Carbon atoms follows which order based on their hybridization? sp > sp 2 > sp 3 sp 3 > sp 2 > sp sp 2 > sp > sp 3 sp > sp 3 > sp 2 The 'Inert Pair Effect' is most prominently observed in which of the following elements? Thallium and Lead Boron and Carbon Aluminum and Silicon Gallium and Germanium Among the following, which element is expected to show the highest oxidation state? Osmium ( Os ) Manganese ( Mn ) Chromium ( Cr ) Fluorine ( F ) According to the Mulliken scale, if an element has an ionization enthalpy of IE and an electron affinity of EA (both in eV ), its electronegativity ( χ M ) is given by: (IE + EA) / 2 (IE - EA) / 2 √(IE × EA) (IE + EA) / 5.6 If the electronegativity difference between two atoms A and B is 1.7 on the Pauling scale, the bond A-B is considered to be: 50% ionic and 50% covalent 100% ionic 100% covalent Purely coordinate The +1 oxidation state is more stable than +3 for Thallium ( Tl ) because of: Inert pair effect Lanthanoid contraction Shielding effect Screening effect Among the following, the most basic oxide is: Tl 2O 3 Al 2O 3 B 2O 3 Ga 2O 3 Which of the following sets contains only neutral oxides? CO, NO, N 2O CO, CO 2, NO N 2O, NO, NO 2 CaO, Na 2O, BaO The correct order of increasing electronegativity for sp, sp 2 and sp 3 hybridized carbon atoms is: sp 3 < sp 2 < sp sp < sp 2 < sp 3 sp 2 < sp < sp 3 sp 3 < sp < sp 2 The nature of the oxide GeO 2 is: Amphoteric Basic Acidic Neutral On the Pauling scale, which two elements have the same electronegativity value of 3.0? Nitrogen and Chlorine Nitrogen and Oxygen Chlorine and Fluorine Carbon and Sulfur The valency of elements in the second period with respect to Oxygen: Increases from 1 to 7 then stays at 0 Increases from 1 to 4 then decreases to 1 Remains constant at 2 Decreases from 7 to 1 The electronegativity of an element on the Mulliken scale is 5.6 . What will be its value on the Pauling scale? 2.0 5.6 1.4 3.2 The element with the highest electronegativity on the Pauling scale is: Fluorine Oxygen Chlorine Nitrogen The electronegativity of an element depends on which of the following factors? All of these Oxidation state of the element Hybridization state of the atom Atomic radius of the atom Which of the following sets of elements is arranged in the correct order of increasing metallic character? P < Si < Be < Mg Be < Mg < Si < P Si < P < Be < Mg Mg < Be < P < Si The Allred-Rochow electronegativity scale is based on: Electrostatic force of attraction between nucleus and valence electrons Average of Ionization Enthalpy and Electron Affinity Bond dissociation energies The radius of the atom only The correct order of bond dissociation enthalpy of halogens is: Cl 2 > Br 2 > F 2 > I 2 F 2 > Cl 2 > Br 2 > I 2 Cl 2 > F 2 > Br 2 > I 2 I 2 > Br 2 > Cl 2 > F 2 The correct order of increasing electronegativity for the following elements is: P < S < N < F S < P < N < F P < S < F < N N < P < S < F Which of the following has the highest electronegativity? sp-hybridized Carbon sp 2 -hybridized Carbon sp 3 -hybridized Carbon All have the same electronegativity Which of the following reflects the correct trend of electronegativity in Group 13 elements? B > Tl > In > Ga > Al B > Al > Ga > In > Tl Tl > In > Ga > Al > B Al > Ga > In > Tl > B The electronegativity values for Group 14 elements (C, Si, Ge, Sn, Pb) show which of the following trends? Decreases from C to Si and then remains almost constant Decreases steadily from C to Pb Increases steadily from C to Pb Remains constant throughout the group The electronegativity difference between two atoms A and B is related to their bond energies (in kcal/mol ) by the Pauling equation: X A - X B = 0.208 . What does represent? The difference between experimental bond energy and the geometric mean of pure covalent bond energies. The sum of the ionization enthalpy and electron affinity of the two atoms. The resonance energy of the molecule AB . The difference between the atomic radii of atoms A and B . The Pauling electronegativity of an element is 3.0. What would be its approximate value on the Mulliken scale? 8.4 3.0 1.5 5.6 The valency of an element depends on: The number of electrons in the outermost shell The total number of electrons in the atom The number of neutrons in the nucleus The mass number of the element Which of the following oxides is most likely to be purely basic? Tl 2O Al 2O 3 B 2O 3 Ga 2O 3 If the ionization enthalpy ( IE ) and electron affinity ( EA ) of an element are 275 kcal/mol and 86 kcal/mol respectively, what is its electronegativity on the Pauling scale? 2.77 3.00 2.52 3.21 The percent ionic character of a bond between two atoms A and B can be estimated using the Hannay-Smith equation: Ionic % = 16|X A - X B| + 3.5|X A - X B| 2 . If the electronegativity difference is 2.0 , what is the percentage of ionic character? 46% 50% 32% 72% Which of the following oxides is most acidic in nature? Cl 2O 7 P 4O 10 SO 3 Al 2O 3 The correct order of electronegativity of the following elements is: F > O > N > C F > N > O > C O > F > N > C C > N > O > F What happens to the basic character of oxides as we move from left to right in a period? Decreases Increases Remains constant First increases then decreases Which of the following oxides is neutral in nature? CO SnO 2 ZnO Al 2O 3