Question # 1

PCl5 is an example of hybridization

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d sp³

d2 sp2

sp2

sp3

The rusting of iron is catalysed by which of the following.

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Fe

O2

Zn

H+

Inert pair effect is that

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When an element shows incertness in chemical combination

When higher oxidation state is more stable than lower oxidation state

When an elecrron pair is present on the atom of an element

When two s -electrons or outermost shell remain paired and do not participate in bonding.

A chemical reaction resulting in a change in the electric charge on the reacting particles may be called as.

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Add ion reaction

Redox reaction

Elimination reaction

Chain reaction

Atomicity of which of the following pair of elements is not same as hydrogen.

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Phosphorus, Nitrogen

Nitrogen, Argon

Nitrogen, iodine

Iodine, sulphur

Which of the following iso -electronic ion would require least energy for the removal of electron.

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Ca2+

Cl-

Ar-

K+

Titanium dioxide shows the lattice strcuture.

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Flluorite

Rutile

Wurtzite

Zeolite

The Lewis structure of which of the following does not have coordinate bond.

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SO2

HNO3

H2SO4

HNO2

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

In each period the element with lest electron affinity belongs to.

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Group 1

Group 14

Group 17

Group 18

An explosive

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Nitroglycerine

Trinitrotoluene

Fluorine perchlorate

All above

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Which one of the following noble gas is obtained by radioactive disintegrastion

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Kr

Br

Rn

Xe

Which one of the following statements if false with respect to CFT.

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In an octahederal crystal field. the d electron on a metal ion occupy the ex of orbitals before they occupy the t98 not of orbitals.

Diamagnetic metal ions cannot have an odd number of electrons

Low spin complexes can be paramagnetic

Low spin complexes contain strong field ligands.

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

When metal orbital are rotated in octahedral field the following representation obtained.

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t2 g + lg

a1 g

t 1 u

All above

The maximum covalence of an element equal to.

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The number of unpaired d electrons

The number of paired p electrons

The number of unpaired a and P electors

The actual number of a and P electrons in the outermost shell

Noble gases are used in discharge tubes to give different colours. Raddish orange glow is due to.

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Ar

Ne

Xe

Kr

The electron gain enthalpy of chlorine is -349 Kj mol-1 ionization energy of Cl would be.

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-349 kJ mol -1

349 kJ mol-1

-698 kJ mol-1

698 kJ mol-1

H2SO4 is manufactured by

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The lead chamber process

The contact process

Both A and B

The Ostwald's process

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