Question # 1

Which of the following species has unpaired electrons in anti-bonding molecular orbitals

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O₂⁺²

N₂^-2

B₂

F₂

Which statement is true about Na and Na+

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size of Na is greater than Na+

Size of Na is smaller than Na+

Both have equal size

Both have same properties

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

Those elements whose electronegativities are 1.2 and 3.2, react to form

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Ionic bond

Covalent bond

Gaseous substance

Definiting a liquid substance

Which one of the following has the greater ionic characters in it.

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HF

HCl

H2O

H2

Which of the following molecule has zero dipole moment.

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NH3

CHCl3

H2O

BF3

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

Both CH4 and NH3 are four electron pair system the angles of CH4 and NH3 are 109.5^o and 107.5 ^o respectively. This deviation is due to.

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Hydrogen bonding in ammonia

Lone pair attraction

Lone pair occupy more space and repel to other bond pairs

Lone pair lone pair repulsion

In BeCl2, the covalent bond is formed due to overlap of

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sp -s

sp -p

sp2 -p

sp3 -p

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

Which one of the following has no tendency of form coordinate covalent bond with H+

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NH3

H2O

CH4

CH3OH

In which molecule all atoms are coplanar.

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CH4

BF3

NH3

PH3

The percentage of s characters in sp3 hybrid orbital is.

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25%

33.3%

50%

75%

The carbon atom is C2H4 is.

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sp3 hybridized

sG2 hybridized

Sp hybridized

dsG2 bybridized

Which of the following molecules have unpaired electrons is the bonding molecular orbitals.

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N2

O2

B2

F2

Which one of the following correctly describe the shape of NH3 molecules.

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tetrahedral

Pyramidal

Angular

Square planar

In which of the following Paris, do the elements form a compound by sharing electrons.

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carbon and chlorine

Lithium and iodine

Neon and oxygen

Potassium ad bromine

Dipole moment is defined as.

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Charge x distance

Charge x Debye

Charge x displacement

Charge x bond energy

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