Question # 1

Metal are

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Hard

Ductile

Malleable

All

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

If Steel is heated to a temperature well below red heat and to then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

Which of the following is most soluble in water.

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BaSO4

Sr SO4

CaSO4

MgSO4

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

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Kr

Br

Rn

Xe

In smelting process the ore is mixed with

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Silica

Coke

Limestone

All

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

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 correct increasing order of bond dissociation energy for N2, O2, F2 and Cl2 is

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N2 < O2 < F2 < Cl2

F2 < Cl2 < O2 < N2

F2 < Cl2 < N2 < O2

N2 < Cl2 < F2 < O2

A red color gas, on condensing ti gives a dark blue liquid.

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NO

N2O

N2O3

N2O4

Which one of following is non polar

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CH2Cl2

CCl4

CHCl3

CH3Cl

Electronegativity is given by

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Average of first and second ionization energies.

Average of first and second electron affinites

Average of ionization energy and electron affinity

None of the above

The state of hybridization of Xe in Xe F6 are

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sp2

sp3

sp3 d

dsp3

Fluorine is.

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Powerful oxidizing agent

Most reactive element

Used as refrigerants

All of above

In a period, the element with biggest electron affinity belong to.

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Group 1

Group 2

Group 17

Group 18

Major achievement of CFT is

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Interpreting the color

Adsorption spectra

Both A and B

None of above

Aluminium reacts with boiling water to liberatedi hydrogen gas along with the formation of.

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Aluminium oxide

Aluminium hydroxide

Aluminium suboxide

Aluminium superoxide

Helium oxygen mixture is used by deep sea divers in preference to nitrogen oxygen mixture, because.

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Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

Due to high pressure deep under the sea, nitrogen and oxygen react to give poisonous nitric oxide.

Nitrogen is highly soluble in wateer

A colorless gas with pleasant odour and sweet taste.

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N2O

N2O3

NO

N2O4

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