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11th Chemistry Weekly Test - 3 ( Chemical bonding )

MABS Institution

11th Chemistry Weekly Test - 3 ( Chemical bonding )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

During the formation of 1 mole of KCl crystal, the amount of energy released is ________.

418.81 kJ
348.56 kJ
718 kJ
70.25 kJ

Which one of the following does not have tetrahedral shape?

NH⁺₄
ClO^-₄
HCHO
CH₄

Identify the molecule which has more than 8 electrons in outermost orbit^-

SO₃
SO₂
P₂O₅
All of these

Which one of the following has tetrahedral shape?

HCHO
BeCl₂
PbCl₂
CF₂Cl₂

In which of the following molecules /ions BF₃, NO₂^-, H₂O the central atom is sp² hybridised?

NH₂^- and H₂O
NO₂^- and H₂O
BF₃ and NO₂^-
BF₃ and NH₂^-

Identify the pair of species that possess same bond order.

\(O_{ 2 }^{ 2- }\), B₂
NO, CO
N₂,O₂
He₂, H₂

Which one of the following has linear shape?

I₃^-
ICI₄^-
BrF₅
IOF₅

Which one of the following is the likely bond angles of sulphur tetrafluoride molecule?

120^o,80^o
109^o,28
90^o
89^o,117^o

Which is the correct lewis structure of BF₃?

Which one of the following has zero dipole moment?

HF
H₂
CO
NO

Identify the correct order of the diatomic species arranged in their increasing order of bond order.

\(He_{2}^{+}<O_{2}^{-}<NO<C_{2}^{2-}\)
\(C_{2}^{2-}<He_{2}^{+}<O_{2}^{-}<NO\)
\(O_{2}^{-}<NO<C_{2}^{2-}<He_{2}^{+}\)
\(NO<O_{2}^{-}<C_{2}^{2-}<He_{2}^{+}\)

When one s and three p orbitals hybridise,

four equvivalent orbitals at 90^o to each other will be formed
four equvivalent orbitals at 109^o28' to each other will be formed
four equivalent orbitals, that are lying the same plane will be formed
none of these

Identify the valence electron for \({ CO }_{ 3 }^{ 2- }\)

42
24
8
20

The atomic orbitals involved in hybridisation of SF₆ molecule is

3s, 3_px' 3_py, 3_pz,3d_z
4s, 4_px, 4_py, 4_pz,3d_x²-y²,3d_xy
3_s, 3_px, 3_py, 3_pz,3\({ d }_{ z }^{ 2 }\),d_x²-y²
3s, 3_px,3_py, 3d_xy,3d_yz, 3d_xy

Pick out the molecule which possess diamagnetic behaviour.

O₂
\({ O }_{ 2 }^{ 2- }\)
\({ O }_{ 2 }^{ - }\)
\({ O }_{ 2 }^{ + }\)

Which one of the following has pentagonal bipyramidal shape?

XeF₄
XeOF₄
IF₇
IOF₅

Which one of the following has trigonal bipyramidal shape?

SF₆
IF⁺₄
AsF₅
SF₄

Of the following molecules, which have shape similar to carbondixide?

SnCl₂
NO₂
C₂H₂
All of these

Shape and hybridisation of IF₅ are

Trigonal bipyramidal, Sp³d²
Trigonal bipyramidal, Sp³d
Square pyramidal, Sp³d²
Octahedral, Sp³d²

The molecules having same hybridisation, shape and number of lone pairs of electons are

SeF₄, XeO₂ F₂
SF₄, Xe F₂
XeOF₄, TeF₄
SeCl₄, XeF₄

Which of the following conditions is not correct for resonating structures?

the contributing structure must have the same number of unpaired electrons
the contributing structures should have similar energies
the resonance hybrid should have higher energy than any of the contributing structure
none of these

Which one of the following hybridisation takes place in the formation of BeC₂?

sp²
sp
sp³
dsp²

Which of the following is paramagnetic?

O₂
N₂
H₂
He₂

Which one is the preferred structure of CO₂?

\(\overset { .. }{ \underset { .. }{ O } } =C=\overset { .. }{ \underset { .. }{ O } } \)
\(:O\equiv -\overset { .. }{ \underset { .. }{ O } } :\)
\(.\overset { . }{ \underset { .. }{ O } } \equiv C\equiv \overset { . }{ O } .\)
\(\\ O=\overset { .. }{ \underset { .. }{ C } } =O\)

How many unpaired electrons are present in oxygen molecule?

0
1
2
3

The types of hybridiration on the five carbon atom from right to left in the, 2,3 pentadiene.

sp³, sp², sp, sp², sp³
sp³, sp, sp, sp, sp³
sp², sp, sp²,sp², sp³
sp³, sp³, sp², sp³, sp³

In CIF₃, NF₃ and BF₃ molecules the chlorine, nitrogen and boron atoms are

sp³ hybridised
sp³ ,sp³ and sp² respectively
sp² hybridised
sp³d, sp³ and sp hybridised respectively

Among the following, the compound that contains, ionic, covalent and Coordinate linkage is

NH₄Cl
NH₃
NaCl
none of these

Which hybridisation is possible in BF₃?

sp²
sp
sp³
sp³d

Assertion: Oxygen molecule is paramagnetic.
Reason: It has two unpaired electron in its bonding molecular orbital.

both assertion and reason are true and reason is the correct explanation of assertion
both assertion and reason are true but reason is not the correct explanation of assertion
assertion is true but reason is false
Both assertion and reason are false

In which one of the following molecule triple bond is present?

O₂
H₂
CO₂
N₂

The formula of the compound is A₂B₃. The number of electrons in the outermost orbits of A and B respectively are,

3 and 6
3 and 2
2 and 3
5 and 2

Identify the incorrect statement regarding the molecule xeO₄.

XeO₄molecule is tetrahedral
XeO₄ molecule is square planar
There are four p\(\pi\)-d\(\pi\) bonds
There are four sp³ - p, s bonds

For a molecule to be stable

N_b a
N_b =N_a
N_b > N_a
N_b\(\ge\) N_a

On the basis of molecular orbital theory, select the most appropriate option.

The bond order of O₂ is 2.5 and it is paramagnetic
The bond order of O₂is 1.5 and it is paramagnetic
The bond order of O₂ is 2 and it is diamagnetic
The bond order of O₂ is 2 and it is paramagnetic

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