ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 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
2 The covalent bonds are Unidirectional Bi-directional Non-directional Multi-directional
3 Noble gases have the electronic configuration with their valance shell ns2np6except one He Ne Kr Xe
4 If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees 109.5° 107.5° 104.5° None
5 Which of the following species has unpaired electrons in antibonding molecular orbitals
6 Which of the hydrogen halides has the highest percentage of ionic character HCl HBr HF HI
7 In sp2hybridization bond angle is _____ 120° 180° 109.5° None
8 Which of the following statements is not correct regarding bonding molecular orbitals? Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed Bonding molecular orbitals have low electron density between the two nuclei Every electron in the bonding molecular orbitals contributes to the attraction between atoms Bonding molecular orbitals are formed when the electron waves undergo constructive interference
9 The number of bonds in nitrogen molecule is
10 The ionization energy of A is high and electron affinity of B is low The ionization energy of A is low and electron affinity of B is high Both the ionization energy of A and electron off affinity of B are high Both the ionization energy of A and electron affinity of B are low
11 Which for the following has no dipole moment HCI H<sub>2</sub>S H<sub>2</sub>O CO<sub>2</sub>
12 SnCI2have ______ shape Planner Tetrahedral Angular None
13 The bond angle depends upon the Types of bonds Number of bonds Non-bonding electron pairs All of the above
14 Molecular orbital picture of N2 indicates One unpaired electron Two unpaired electron No unpaired electron None of these
15 On the basis of VSEPR theory SO2is a Liner molecule A bent molecule A strong molecule A gaseous molecule
16 The bond angles in methane CH4are equal to 109.5° 107.5° 104.5° 120°
17 The shape of methanol, ammonia and water molecule can be explained by assuming Sp<sup>3 </sup>hybridization Sp<sup>2</sup>hybridization Sp hybridization All of these
18 Which of the following is a polar molecules Carbon dioxide Carbon tetrachloride Methanol Ethane
19 Which of the following has highest bond order
20 A bond between two atoms may be obtained by sharing of electrons such a bond is called An ionic bond A coordinate bond A dative bond A covalent bond
21 The electronegativity of elements in a period from left to right Decreases Increases First decreases then increases First increases then decreases
22 The electron affinity of chlorine may be represented by the equation
23 154 pm 133 pm 120 pm 150 pm
24 The equation for the first ionization energy of hydrogen is
25 Ionic radius, in a period from left to right Increases Decreases Decreases then increases Increases and decreases
26 The atomic radius of hydrogen is 37 Pecometer Manometer Angstrom Micrometer
27 When two hydrogen atoms approach to form a chemical bond The repulsive forces dominate the attractive forces The attractive forces, dominate the repulsive forces The energy of atoms increases The two atoms start ionization
28 Elements have the tendency to attain 8 electrons in their valence shell. This is known as Octer rule Hunds rule Pauli exclusion principle Auf ban principle
29 The driving force for making a bond is To attain noble gas electronic configuration To make soled compounds To make different compounds To make gaseous substances
30 Which of the following molecules has a net dipole moments CO<sub>2</sub> CS<sub>2</sub> SO<sub>2</sub> CCI<sub>4</sub>
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