Question # 1

Which of the following species has unpaired electrons in antibonding molecular orbitals

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The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

The tendency of an atom to attract shared electron pair towards itself is called

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Covelent bond

Electronegativity

Ionization potential

Electronic affinity

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

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

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O₂

N₂

Br₂

F₂

The bond angle depends upon the

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Types of bonds

Number of bonds

Non-bonding electron pairs

All of the above

The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is

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HF

HCL

HBr

HI

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

Maximum hydrogen bonds in water are

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4

3

2

8

The shape of the molecule SF₂Cl₂is

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Trigonal bipyradmidal

Cubic

Octahedral

Tetrahedral

The driving force for making a bond is

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To attain noble gas electronic configuration

To make soled compounds

To make different compounds

To make gaseous substances

Which one of these is weakest?

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Ionest bond

Covalent bond

Metallic bond

Van der Waal's forces

B-atom in BF₃has

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sp³hybridization

sp²hybridization

sp hybridization

no hybridization

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

Elements have the tendency to attain 8 electrons in their valence shell. This is known as

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Octer rule

Hunds rule

Pauli exclusion principle

Auf ban principle

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

N-atom forms three covalent bonds, its electronic configuration is

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The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

Nitrogen in NH₃is sp³hybridized but the bond angle in NH₃is 107° and not 109.5° due to

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sp³orbital planar

sp³orbital trigonal

Repulsion between lone pair and bonded pairs

None of them

A bond between two atoms may be obtained by sharing of electrons such a bond is called

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An ionic bond

A coordinate bond

A dative bond

A covalent bond

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxyhe

Water molecules associate through hydrogen bonding

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

The electron affinity of chlorine may be represented by the equation

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Which of the following has unchanged valency?

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H

Na

Fe

Oxygen

Shielding effect intervening electrons causes

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Decreases in atomic radii in a period from right to left

Increase in atomic radii in a period from left to righ t

Decrease in atomic radii down the group

Increase in atomic radii down the group

Mg becomes isoelectronic with neon when it

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Loses two electrons

Gains two electrons

Loses 1 electron

Gains 1 electron

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