| 1 |
The ionic bonds are
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A. Unidirectional
B. Bi-directional
C. Non-directional
D. Multi-directional
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| 2 |
|
A. Excitantion of an electron from 2s to 2p-orbital
B. Transfer of three electrons from B to the other atoms
C. Excitation of two electrons form 2s orbital to 2p orbital
D. Formation of molecular ion
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| 3 |
Ionic radius, in a period from left to right
|
A. Increases
B. Decreases
C. Decreases then increases
D. Increases and decreases
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| 4 |
The bond angle depends upon the
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A. Types of bonds
B. Number of bonds
C. Non-bonding electron pairs
D. All of the above
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| 5 |
Three sp2hybrid are co-planar at an angle of
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A. 104.5°
B. 109.5°
C. 107°
D. 120°
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| 6 |
Which of the following molecules have its central atom sp2hybridized
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A. CH4
B. C2H2
C. C2H4
D. CCl4
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| 7 |
The shape of CIO-3according to valence shell electron pair repulsion theory will be
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A. Planar triangle
B. Pyramidal
C. Tetrahedral
D. Square planar
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| 8 |
When an electron is absorbed in an empty or partially filled orbital of an atom, the energy released is called
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A. Ionization energy
B. Potential energy
C. Electron affinity
D. Bond energy
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| 9 |
Which of the following has polar bond
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A. O2
B. N2
C. HCl
D. Cl2
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| 10 |
Which of the following molecules have multiple bonds
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A. CH4
B. C2H4
C. C2H6
D. CCI4
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| 11 |
Which of the following hydrides has the lowest boiling point?
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A. H2O
B. H2S
C. H2S3
D. H2Te
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| 12 |
Which of the following statements is not correct regarding bonding molecular orbitals?
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A. Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed
B. Bonding molecular orbitals have low electron density between the two nuclei
C. Every electron in the bonding molecular orbitals contributes to the attraction between atoms
D. Bonding molecular orbitals are formed when the electron waves undergo constructive interference
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| 13 |
Generally ionization energy of atoms decreases by
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A. Decreases in atomic size
B. Increase in atomic size
C. Increase in nuclear charge
D. None of these
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| 14 |
Antibonding MO is formed by
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A. Addition of atomic orbitals
B. Substraction of atomic orbitals
C. Multiplication of atomic orbitals
D. None of these
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| 15 |
The number of antibonding electron pairs in O2-molecular ion on the basis of MOT is
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A. 4
B. 3
C. 2
D. 5
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| 16 |
The electron affinity of chlorine may be represented by the equation
|
A.
B.
C.
D.
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| 17 |
The degree of polarity of molecule is known as its
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A. Dipole moment
B. Moment arm
C. Bond energy
D. Ionic character
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| 18 |
The geometry of 4 sp3hybrid orbitals on an atom is
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A. Square planar
B. Tetrahedral
C. Trigonal planar
D. Linear
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| 19 |
Mg becomes isoelectronic with neon when it
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A. Loses two electrons
B. Gains two electrons
C. Loses 1 electron
D. Gains 1 electron
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| 20 |
In which of the following theories the hybridizationis considered
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A. Vsepr
B. Lewis
C. Molecule orbital
D. Valence bond
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| 21 |
The tendency of an atom to attract shared electron pair towards itself is called
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A. Covelent bond
B. Electronegativity
C. Ionization potential
D. Electronic affinity
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| 22 |
Which of the following molecules has unpaired electrons in anti-bonding molecular orbitals?
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A. O2
B. N2
C. Br2
D. F2
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| 23 |
According to MO Theory, the species O2+ possesses
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A. bond order of 2.5
B. three unpaired
C. diamagnetic character
D. stability lower then O2
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| 24 |
Maximum hydrogen bonds in water are
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A. 4
B. 3
C. 2
D. 8
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| 25 |
Which of the following has unchanged valency?
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A. H
B. Na
C. Fe
D. Oxygen
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| 26 |
Which of the following molecules has a net dipole moments
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A. CO2
B. CS2
C. SO2
D. CCI4
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| 27 |
Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?
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A. Orbital overlap will not occur
B. Bonding will not occur
C. Both (A) and (B) are correct
D. None of the above are correct
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| 28 |
Size of an anion is increased as compared to its atom because of the
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A. Addition of new shell
B. Repulsion of electrons in the valence shell
C. Decrease in nuclear charge
D. Increase in the unclear charge
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| 29 |
|
A. 154 pm
B. 133 pm
C. 120 pm
D. 150 pm
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| 30 |
In OF2, number of bond pairs and Ione paris of electrons are respectively
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A. 2,6
B. 2,8
C. 2,10
D. 2,9
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