Question # 1

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

In a group, the atomic radii from top to bottom

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increase

decrease

don't change

show variable trend

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

Greater shielding effect corresponds to ionization potential value

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greater

lesser

remain same

no effect

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

A molecule that has polar bonds but is overall non - polar

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IF

CCl4

PCI3

All

The ionization energy

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generally increases from left to right in a period

increases from top to bottom in a group

does not change in a period

does not change in a group

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

For formation of ionic bond, electronegativity difference should be

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Equal to zero

Equal to 0.5

More then 1.7

Less than 1.7

Total number of valence electrons in phosphonium ion (PH4-) is

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8

9

12

10

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

Elements having high ionization potential values are

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metals

non- metal

liquids

solid

Elements of group IA and IIA are

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electronegative

neutral

electropositive

non-metals

The no. of Ip's on oxygen in CO are

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1

3

4

2

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

What is not true for NH4CI

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It has ionic bond

It has covalent bond

It has coordinate bond

It has hydrogen bond

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