Question # 1

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

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.

Among the elements of second period the element with highest melting point belongs to group.

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1

14

17

18

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because.

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NH3 is not a planar molecule while BF3 is a planar molecule.

NH3 is a planar molecule, while BF3 is a planner molecule.

Fluorine is more electronetative than nitrogen

Born is more electronegative than nitrogen

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

Metal crystallize is system having co ordination number

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8

12

14

any one of above

The bond order for BO molecule is.

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2.5

3.0

2.0

3.5

Fluorine finds considerble use of DDFT which is used as.

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herbicide

Fungacide

Insecticide

Nomatocides

HCIO2 gives the structure of a.

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Linear

Angular

trigonal pyramidal

Tetra hddral

Among the elements of third period, the element with lowest boiling point belongs to group.

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1

14

16

18

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

Which one of the following pairs are chemically dissimilar.

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Na and K

Ba and Sr

Zr and HF

Ca and Zn

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

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

The ionic product equilibrium constant is.

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Ka

Kb

Kc

Kw

Aluminium does not corrode as does iron because.

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AI does not react with O2

a-protective layer of Al2O3 forms on the metal surface

AI is harder to oxidize than is Fe

Fe gives chathodic protection to AI

Elements of group 14 have the electronic configuration of their outer shell as

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ns2 np3

ns2 np2

ns2 np6

ns2

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

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