Which one of the following is not paramagnetic ?
1. NO
2.
3. CO
4.
The angular shape of ozone molecule (O3) consists of
1. 1 sigma and 2 pi-bonds
2. 2 sigma and 2 pi-bonds
3. 1 sigma and 1 pi-bonds
4. 2 sigma and 1 pi-bonds
In which of the following molecules are all the bonds not equal?
1. ClF3
2. BF3
3. PF3
4. NF3
According to molecular orbital theory, arrange the nitrogen species in each list in ascending order of bond order:
1.
2.
3.
4.
Which one of the following is planar ?
1. XeF4
2. XeO4
3. XeO3
4. XeO3F2
The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be
1. reduced to in water than in air
2. reduced to in water than in air
3. will be increased to 80 in water than in air
4. will remain unchanged
Which of the following is isoelectronic?
1.
2.
3.
4.
In an octahedral structure, the pair of d orbitals involved in d2sp3-hybridisation is
1.
2.
3.
4.
Equilateral shape has
1. sp hybridisation
2. sp2 hybridisation
3. sp3 hybridisation
4. dsp2 hybridisation
Overlap of which of the following atomic orbitals would be maximum to form the strongest covalent bond.
1. 1s-2s (σ)
2. 1s-2p (σ)
3. 2p-2p (π)
4. 2p-2p (σ)
Among LiCl, BeCl2, BCl3 and CCl4,
the covalent bond character varies as:
1. LiCl < BeCl2 > BCl3 > CCl4
2. LiCl > BeCl2 < BCl3 < CCl4
3. LiCl < BeCl2 < BCl3 < CCl4
4. LiCl > BeCl2 > BCl3 > CCl4
Which of the following statement is not correct from the view point of molecular orbital theory ?
1. Be2 is not a stable molecule
2. He2 is not a stable but He2+ is expected to exist.
3. Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.
4. The order of energies of molecular orbitals in N2 molecule is
s2s < s*2s < s2pz < (p2px=p2py) < (p*2px=p*2py) < s*2pz
Compound that does not exhibit hydrogen bonding is-
1. | CH3CH2OH | 2. | |
3. | 4. |
PCl5 is highly unstable and in a solid-state, it exists as into [PCl4]+ and [PCl6]- ions.
The geometry of [PCl6]- is
1. Octahedral
2. Tetrahedral
3. Square pyramidal
4. Square planar
Which of the following species has maximum number of lone-pair of electrons on the central atom ?
1. XeF2
2. H3O+
3. XeF4
4. XeF6
Which is the least polarizable gas among the following?
1. | He | 2. | Ne |
3. | Kr | 4. | Xe |
The correct order of bond angle order is
(1)
(2)
(3)
(4)
The number of sigma bonds in P4O10 is
1. 6
2. 16
3. 20
4. 7
Among the following iso-structural compounds, the one that has the highest lattice energy is:
1. LiCl
2. MgO
3. NaCl
4. LiF
A sbonded molecule MX3 is T-shaped. The number of non-bonding pairs of electrons is :
1. 0
2. 2
3. 1
4. Can be predicted only if atomic number of M is known,
In a chemical change from , the hybrid state of P changes from:
1. sp2 to sp3
2. sp3 to sp2
3. sp3 to sp3d
4. sp3 to dsp2
Which molecules/ions are most paramagnetic?
1. B2
2. C2
3.
4.
In which case observed dipole moment is greater than theoretical dipole moment?
1.
2.
3.
4.
Which has highest bond angle ?
(1) NH3
(2) H2O
(3) H2S
(4) PH3
Select the correct order of solubility (in water) from the following:
1. SrSO4 < CaSO4 < MgSO4 < BeSO4
2. NaF < KF < RbF < CsF
3. Ba(OH)2 > Sr(OH)2 > Ca(OH)2 > Mg(OH)2
4 All of the above
The hydride of group 16 having highest boiling point is:
1. H2O because of H-bonding
2. H2Te because of higher molecular weight
3. H2S because of H-bonding
4. H2Se because of lower molecular weight
Which of the following is correct :-
(1) Extent of hydration is PCl5 > SiCl4 and BCl3 < CCl4
(2) K+ ion will be more Hydrated than Li+
(3) In BCl3 there are no vacant d-orbitals but still it can undergo expansion
(4) None
The correct order in which the O-O bond length increases in the following is
1. H2O2 < O2 < O3
2. O3 < H2O < O2
3. O2 < O3< H2O2
4. O2 < H2O2 < O3
Carbon suboxide (C3O2) has
1. Linear structure
2. Bent structure
3. Trigonal structure
4. Disorted tetrahedral structure
The pair of electrons in the given carbanion, CH3C≡C-, is present in which of the following orbitals?
1. | sp3 | 2. | sp2 |
3. | sp | 4. | 2p |
Which of the following species contains equal number of and bonds?
1.
2. XeO4
3. (CN)2
4. CH2(CN)2
The correct bond order in the following species is
1.
2.
3.
4.
XeF2 is isostructural with :
1. TeF2
2. ICI2-
3. SbCl3
4. BCl3
Which one of he following pairs is isostructural (i.e., having the same shape and
hybridization)?
1. [BCl3 and BrCl3]
2. [NH3 and ]
3. [NF3 and BF3]
4. [ and ]
Bond order of 1.5 is shown by
1.
2.
3.
4. O2
What is the dominant intermolecular force on bond that must be overcome in converting
liquid CH3OH to a gas?
1. Hydrogen bonding
2. Dipole-dipole interaction
3. Covalent bonds
4. London dispersion force
The correct order of electronegativity of hybrid orbitals of carbon is:
(1) sp>sp2<sp3
(2) sp>sp2>sp3
(3) sp<sp2>sp3
(4) sp<sp2<sp3
has a net dipole moment while Be has zero dipole moment because :
(1) F is more electronegativity than oxygen
(2) Be is more electronegativity than oxygen
(3) molecule is linear and Be is bent
(4) molecule is linear and is bent
Which of the following compound have the same no. of lone pair with their central atom?
(i)
(ii)
(iii)
(iv)
(v) Triple Methylene
options are as follows :
(1) (iv) and (v)
(2) (i) and (iii)
(3) (i) and (ii)
(4) (ii) (iv), (v)
In which of the following species central atom is NOT surrounded by exactly 8 valence electrons?
(a)
(b)
(c) PC
(d)
The least polar bond is present in which of the following?
1. | O-F | 2. | P-F |
3. | Si-N | 4. | B-F |
Which set contains only covalently bonded molecules?
(1)
(2)
(3)
(4)
is:
(1) non-polar compound
(2) electrovalent compound
(3) having low value of dipole moment than
(4) having more dipole moment than
Which of the following statement is true for according to VSEPR theory?
(A) The lone pair and two I-O double bonds occupy the equatorial positions of trigonal
bipyramid.
(B) It has hybridization and is T-shaped.
(C) Its structure is analogous to .
(D) (A) and (C) both
Most covalent compound among the following is :
1. | AlF3 | 2. | AlCl3 |
3. | AlBr3 | 4. | AlI3 |