ECAT Chemistry Chapter 6 Chemical Bonding Online Test With Answers

ECAT Chemistry Chapter 6 Chemical Bonding Online Test

Sr. # Questions Answers Choice
1 Atoms obey octet rule by sharing-electrons making covalent bonds according to Lewis and Kossal theory Valance bond theory VSEPR theory Molecular orbital theory
2 Generally the bond formed by metals with non-metals is Ionic Covalent Polar Non- polar
3 An ionic compound M2S3is formed by the metal M,, the metal is Ca Ba K Al
4 Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is 1 2 3 4
5 All covalent bonds formed between the two atoms are non-polar when Covalent bond between two non-metal atoms Covalent bond between metal and non-metal Covalent bond between two atoms of same element Covalent bond between metal atoms
6 The Electro-negatively difference for ionic bond must be greater than 1.6 1.7 1.8 1.0
7 Electronegativity values of the elements F, CI and Br vary F > CI > Br Br > CI > F Cl > Br > F CI > F > Br
8 From the difference between expected bond energies for the normal covalent bond and experimentally determined values Pauling calculated the values of Ionization potential of elements Electron affinity of elements Electronegativity of elements Bond length
9 The tendency of an atom to attract shared electron pair towards itself is called Covelent bond Electronegativity Ionization potential Electronic affinity
10 When of the following is isolelectronic with krypton Ca<sup>++</sup> Al<sup>+++</sup> Br<sup>-1</sup> I<sup>-1</sup>
11 The degree of polarity of molecule is known as its Dipole moment Moment arm Bond energy Ionic character
12 Generally electron affinities for elements in a period from left to right Decreases Increases Remain same Increases alternatively
13 When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called Ionization energy Potential energy Electron affinity Bond energy
14 In a group the atomic size increase downward due to Addition of electronic shells Increase in the proton number Repulsion of electrons All of the above
15 Ca, Mg, Be, Ba, belong to the same group, the order of their ionization energy values is Be &gt; Mg&gt; Ca &gt; Ba Ba &gt; Ca &gt; Mg &gt; Be Ca &gt; Mg &gt; Be &gt; Ba Ba &gt; Mg &gt; Ca &gt; Be
16 Ionization energies increase from left to right along the period due to Increase in nuclear charge Repulsion of electron increases Repulsion of protons increase Atomic size increase along the period
17 Which of the following charge Li Be H He
18 Generally ionization energy of atoms decreases by Decreases in atomic size Increase in atomic size Increase in nuclear charge None of these
19 Size of an anion is increased as compared to its atom because of the Addition of new shell Repulsion of electrons in the valence shell Decrease in nuclear charge Increase in the unclear charge
20 The ionic bonds are Unidirectional Bi-directional Non-directional Multi-directional
21 Shielding effect intervening electrons causes Decreases in atomic radii in a period from right to left Increase in atomic radii in a period from left to righ t Decrease in atomic radii down the group Increase in atomic radii down the group
22 When elements of group I react with the elements of group VIA theory form Ionic bond Covalent bond Polar bond None
23 Mg becomes isoelectronic with neon when it Loses two electrons Gains two electrons Loses 1 electron Gains 1 electron
24 Two H-atom combine to form a strong H2molecule due to Increase in potential energy Decrease in potential energy Energy remains unchanged Distance is increased
25 The formation of compounds like PF5, BCI3, SF6indicates that These halides are ionic These halides are covalent They are Lewis acids Octet rule not obeyed so the rule is not universal
26 The covalent bonds are Unidirectional Bi-directional Non-directional Multi-directional
27 Noble gases have the electronic configuration with their valance shell ns2np6except one He Ne Kr Xe
28 If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees 109.5° 107.5° 104.5° None
29 Which of the following species has unpaired electrons in antibonding molecular orbitals
30 Which of the hydrogen halides has the highest percentage of ionic character HCl HBr HF HI
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