ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 A reaction in which heat is given out is An endothermic reaction An exothermic reaction A thermochemical reaction An energetic reaction
2 When a bond breaks Heat is evolved Heat is absorbs No change in heat contents takes place Temperature increases
3 Termochemistry is the study of chemical reaction accompanying Heat change Rate change Mass change Volume change
4 Which of the following molecules have multiple bonds CH<sub>4</sub> C<sub>2</sub>H<sub>4</sub> C<sub>2</sub>H<sub>6</sub> CCI<sub>4</sub>
5 Which of the following has polar bond O<sub>2</sub> N<sub>2</sub> HCl Cl<sub>2</sub>
6 The number of electron pairs shared in carbon tetrachloride molecule is 2 3 4 1
7 Atoms obey octet rule by sharing-electrons making covalent bonds according to Lewis and Kossal theory Valance bond theory VSEPR theory Molecular orbital theory
8 Generally the bond formed by metals with non-metals is Ionic Covalent Polar Non- polar
9 An ionic compound M2S3is formed by the metal M,, the metal is Ca Ba K Al
10 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
11 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
12 The Electro-negatively difference for ionic bond must be greater than 1.6 1.7 1.8 1.0
13 Electronegativity values of the elements F, CI and Br vary F &gt; CI &gt; Br Br &gt; CI &gt; F Cl &gt; Br &gt; F CI &gt; F &gt; Br
14 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
15 The tendency of an atom to attract shared electron pair towards itself is called Covelent bond Electronegativity Ionization potential Electronic affinity
16 When of the following is isolelectronic with krypton Ca<sup>++</sup> Al<sup>+++</sup> Br<sup>-1</sup> I<sup>-1</sup>
17 The degree of polarity of molecule is known as its Dipole moment Moment arm Bond energy Ionic character
18 Generally electron affinities for elements in a period from left to right Decreases Increases Remain same Increases alternatively
19 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
20 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
21 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
22 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
23 Which of the following charge Li Be H He
24 Generally ionization energy of atoms decreases by Decreases in atomic size Increase in atomic size Increase in nuclear charge None of these
25 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
26 The ionic bonds are Unidirectional Bi-directional Non-directional Multi-directional
27 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
28 When elements of group I react with the elements of group VIA theory form Ionic bond Covalent bond Polar bond None
29 Mg becomes isoelectronic with neon when it Loses two electrons Gains two electrons Loses 1 electron Gains 1 electron
30 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
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