Question # 1

Which one of following is paramagnetic and has the bond order equal to 0.57

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N2

H2+

O2

F2

The bond length is measured by

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X-ray diffraction

Neutron diffraction

Microwave spectroscopy

All of above

AI Cl3 acts as a strong Lewis acid, because it is.

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A covalent compound

Readily hydrolyzed

Electron deficient

An ionic compound

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

All the member of group III A are metals except.

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B

Ai

Ga

In

What % if nickel is present in the major ore Pentlandite.

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22%

18%

14%

10%

The pH of the tears is

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7.0

7.4

7.8

8.2

Highly dangerous acid and produces severe wounds on the skin.

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HCIO

HCIO2

HCIO3

HCIO4

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

On hybridization of one s and one p orbitals we get.

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Two mutualy perpendicular orbitals

Two orbitals at 180^o

Four orbitals directed tetrahedrally

Three orbitals in a plane

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

Pick out the incorrect statement for XeF4

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XeF4 disproportionate violently with water

It is used as fluorinating agent

It has octahedral structure for geometry

It oxidizes I to I₂

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

An explosive

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Nitroglycerine

Trinitrotoluene

Fluorine perchlorate

All above

When borax is strongly hented, it gives

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B2O4

Na2B4O7

NaBO2

NaBO2 + B2O3

Potassium reacts with excess of oxygen to form

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K2O

K2O2

KO2

K2O3

Which of the following ions is smallest in size.

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F-

Cl-

I-

Br-

The halide which is inert to water is

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PCl5

SiCl4

BCl3

SF3

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

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