Question # 1

Suppose a new element 'J' has discovered and has seven electron in the valence shell. Which statement about this element would be correct.

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It is monatomic

It form covalent bond with hydrogen

It forms stable positive ion

It forms covalent bond with group IA element

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

The bond order of N2 molecule is.

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1

2

3

4

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

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

The percentage of s characters in sp3 hybrid orbital is.

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25%

33.3%

50%

75%

The tendency of an tom to attract shared pair of electron towards itself is called its.

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Ionization energy

Electronegativity

Electron affinity

dipole moment

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

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HF

HCl

H2O

H2

Fluorine molecule (F₂) is formed by the overlap of

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s - s orbital

s - p orbital

p - p head on overlapping of orbitals

p - p parallel overlapping of orbitals

The H - H Bond energy in KJ mole -1 is.

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346

436

463

336

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

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tetrahedral

Pyramidal

Angular

Square planar

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

In a period of periodic table, atomic radii

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Increases

Decreases

Remain same

First decreases than increases

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

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O2

N2

B2

F2

Which of the following has bond angle of 120 ^o

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BeCl2

BF3

CH4

NH3

Percentage ionic character of HF is.

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100%

80%

43%

57%

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

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NH3

H2O

CH4

CH3OH

Which element has highest ionization potential

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Li

Na

K

Rb

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