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 > Mg> Ca > Ba
Ba > Ca > Mg > Be
Ca > Mg > Be > Ba
Ba > Mg > Ca > 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
|