Question # 1

The shape of H₃O is

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Tetrahedral

Angular

Trigonal planer

Pyramidaj

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

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tetrahedral

Pyramidal

Angular

Square planar

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

Which of the following has linear structure.

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CO2

NH3

CH4

H2O

______ Molecule has zero dipole moment.

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CO

H2S

SO2

CH4

In a group of periodic table, ionization energy.

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Decreases

Increases

Remains same

First increases than increases

Carbon atom in methane in hybridized.

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sp3

Sp2

Sp

dsp3

BF3 has zero while NH3 has 1.49 D dipole moment because.

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B is less electronegative than N

F is more electronegative than N

BF3 is pyramidal while NH3 is planar

NH3 is pyramidal while BF3 is trigonal planar

Dipole moment is defined as.

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Charge x distance

Charge x Debye

Charge x displacement

Charge x bond energy

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

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

Which of the following has highest percentage ionic character.

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HCl

HF

HBr

HI

Which of the hydrogen halides has the highest percentage of ionic character

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HF

HBr

HCI

HI

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

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N2

O2

B2

F2

A molecule has two ions pairs and two bond pairs around the central atom. The shape of molecule is.

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Linear

Pyramidal

Angular

Tetrahedral

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Ionic bond is formed by combination of groups

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IA and VIII

II A and VII A

IV A and VA

VIA and VII A

Which molecules is 100% covalent

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H2

H2O

HF

NH3

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