Question # 1

Which of the following molecules have sp³hybridized carbon

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CH₄

C₂H₄

C₂H₂

CO₂

All covalent bonds formed between the two atoms are non-polar when

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Covalent bond between two non-metal atoms

Covalent bond between metal and non-metal

Covalent bond between two atoms of same element

Covalent bond between metal atoms

Outer shells of two elements X and Y have two and six electrons respectively. If they combine, the expected formula of compound will be

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XY

X₂Y

X₂Y₃

XY₂

Fluorine molecule is formed by

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The axial p-p overlap

The sidewise p-p overlap

The axial s-p overlap

The overlap of two sp²hybrid orbitals

XeF₄has shape of

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Sphere

Trigonal bipyramidal

Tetrahedral

Square planar

Three sp²hybrid are co-planar at an angle of

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104.5°

109.5°

107°

120°

Which of the following geometry is associated with the compound in which the central atom assumes sp³d hybridization?

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Planar

Pyramidal

Angular

Trigonal bipyramidal

The covalent bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

Which of the following hydrides has the lowest boiling point?

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H₂O

H₂S

H₂S3

H₂Te

Which for the following has no dipole moment

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HCI

H₂S

H₂O

CO₂

When elements of group I react with the elements of group VIA theory form

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Ionic bond

Covalent bond

Polar bond

None

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

Tripple bond is present in

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O₂

H₂

N₂

Cl₂

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these

The bond angles in methane CH₄are equal to

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109.5°

107.5°

104.5°

120°

The atomic radius of hydrogen is 37

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Pecometer

Manometer

Angstrom

Micrometer

Which of the following molecules has a net dipole moments

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CO₂

CS₂

SO₂

CCI₄

The shape of CIO^-₃according to valence shell electron pair repulsion theory will be

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Planar triangle

Pyramidal

Tetrahedral

Square planar

The boiling point of heavy water is

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108°C

101.4°C

99°C

110°C

The electronegativity of elements in a period from left to right

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Decreases

Increases

First decreases then increases

First increases then decreases

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

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

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

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Orbital overlap will not occur

Bonding will not occur

Both (A) and (B) are correct

None of the above are correct

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

In OF₂, number of bond pairs and Ione paris of electrons are respectively

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2,6

2,8

2,10

2,9

One of the following bonds is polar but compound is non-polar

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H₂O

NH₃

HCl

CO₂

Which one of these is weakest?

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Ionest bond

Covalent bond

Metallic bond

Van der Waal's forces

An ionic compound M₂S₃is formed by the metal M,, the metal is

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Ca

Ba

K

Al

In sp²hybridization bond angle is _____

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120°

180°

109.5°

None

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

In H₂O molecule the bond angle is

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90°

109.5°

107°

104.5°

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