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11th Chemistry Monthly Test - 2 ( Chemical bonding )

MABS Institution

11th Chemistry Monthly Test - 2 ( Chemical bonding )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Energy levels of molecular orbitals have been experimentally determined by __________studies.

X-rays
Spectroscopic
Microscopic
Crystallographic

Which among the following molecule obeys octet rule?

NO
NO₂
N₂O₃
ClO₂

Using MO theory, predict which of the following species has the shortest bond length?

O₂⁺
O₂^-
C₂^2-
O₂²⁺

Which one of the following has zero dipole moment?

HF
H₂
CO
NO

For a molecule to be stable

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

Shape and hybridisation of IF₅ are

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

Among the following which shows the maximum covalent character?

MgCl₂
FeCl₂
SnCl₂
AlCl₃

Which of the following is paramagnetic?

O₂
N₂
H₂
He₂

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

Paramagnetism is due to the presence of ___________electrons.

paired
unpaired
partially filled
fully filled

Part - B

Generic 2 - Answer All Question

What is meant by metallic bond?

Give reason for the higher melting point value of AlF₃ (solid) than SiF₄ (gas).

What is the total number of sigma and pi bonds in the following molecules?
a) C₂H₂
(b) C₂H₄

Represent the bond formation in [Fe(CN)₆]^4- and BF₃-NH₃

DefineBond angle.

Hydrogen gas is diatomic where as inert gases are monoatomic – explain on the basis of MO theory.

What type of hybrldlsation is involved in N\({ O }_{ 2 }^{ - }\) ion?

Part - C

Generic 3 - Answer All Question

Apart from tetrahedral geometry, another possible geometry for CH₄ is square planar with four H atoms at the corners of the square and C atom at its centre. Explain why CH₄ is not square planar?

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, 0, N, Br.

Draw and explain the molecular orbital diagram of carbon molecule.

Write Lewis symbols for the following atoms and ions: S and S^2--;Al and Al³⁺; Hand H^-

Give the bond order for hydrogen molecule, nitrogen molecule and NO.

Draw the lewis structure of (I)Ammonia (il) Methane (iil) Dinitrogen pentoxide.

Draw the Lewis structures for the following molecules and ions:
H₂S, SiCI₄, BeF₂, CO₃^2-, HCOOH

Part - D

Generic 5 - Answer All Question

Calculate the bond order and predict the magnetic nature of the following molecules.
(i) \({ H }_{ 2 }^{ + }\)
(ii) \({ Li }_{ 2 }^{ - }\)
(iii)\({ Li }_{ 2 }\)
(iv) \({ B }_{ 2 }\)
(v) \({ C }_{ 2 }^{ + }\)

Give suitable answers for the following questions:
(i) Arrange NaCl, MgCl₂ and AlCl₃ in the increasing order of covalent character
(ii) Among Na⁺, Ca²⁺,Mg²⁺,AP³⁺ which has high polarising power?
(iii) CCl₄ is insoluble in water but NaCI is soluble Why?
(iv) Among NaCl, KCI and RbCI which one has highest lattice enthalpy? Why?
(v) What are the main conditions for the formation of an ionic bond?

Draw the Lewis dot structure for the following.
(i) SO₃
(ii) NH₃
(iii) CH₄
(iv) N₂O₅
v) HNO₃

Explain the formation of methane using VB theory?

(i) What is meant by covalent bond?
(ii) Explain the covalent bonding in H₂, O_2,Nr
Explain about valence bond theory for the formation of H₂ molecule.

How are bonding and anti-bonding molecular orbitals formed? Represent the constructive and destructive interaction in the 1s orbitals.

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