ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 When elements of group I react with the elements of group VIA theory form Ionic bond Covalent bond Polar bond None
2 Mg becomes isoelectronic with neon when it Loses two electrons Gains two electrons Loses 1 electron Gains 1 electron
3 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
4 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
5 The covalent bonds are Unidirectional Bi-directional Non-directional Multi-directional
6 Noble gases have the electronic configuration with their valance shell ns2np6except one He Ne Kr Xe
7 If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees 109.5° 107.5° 104.5° None
8 Which of the following species has unpaired electrons in antibonding molecular orbitals
9 Which of the hydrogen halides has the highest percentage of ionic character HCl HBr HF HI
10 In sp2hybridization bond angle is _____ 120° 180° 109.5° None
11 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
12 The number of bonds in nitrogen molecule is
13 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
14 Which for the following has no dipole moment HCI H<sub>2</sub>S H<sub>2</sub>O CO<sub>2</sub>
15 SnCI2have ______ shape Planner Tetrahedral Angular None
16 The bond angle depends upon the Types of bonds Number of bonds Non-bonding electron pairs All of the above
17 Molecular orbital picture of N2 indicates One unpaired electron Two unpaired electron No unpaired electron None of these
18 On the basis of VSEPR theory SO2is a Liner molecule A bent molecule A strong molecule A gaseous molecule
19 The bond angles in methane CH4are equal to 109.5° 107.5° 104.5° 120°
20 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
21 Which of the following is a polar molecules Carbon dioxide Carbon tetrachloride Methanol Ethane
22 Which of the following has highest bond order
23 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
24 The electronegativity of elements in a period from left to right Decreases Increases First decreases then increases First increases then decreases
25 The electron affinity of chlorine may be represented by the equation
26 154 pm 133 pm 120 pm 150 pm
27 The equation for the first ionization energy of hydrogen is
28 Ionic radius, in a period from left to right Increases Decreases Decreases then increases Increases and decreases
29 The atomic radius of hydrogen is 37 Pecometer Manometer Angstrom Micrometer
30 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
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