Question # 1

In 1952 who popularized the use of CFT for inorganic chemist

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Bethe

Orge

Van Vleck

Werner

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

The purification of Bauxite can be carried out.

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Baeyer's process

Hall's process

Serpek's process

Any of above

Which of the following species has highest bond energy.

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H2

T2

D

Cl

Among oxides of nitrogen all are gases except.

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N2O5

N2O

NO

N2O3

Hydrometallurgy of copper involves extraction of copper from poor ores by which process.

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Dry process

Wet process

Both dry and wet process

None of these

In group 17, the element with highest first ionization enthalpy belongs to.

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Period 1

Period 2

Period 7

Period 6

Which group contains elements that exist as monoatomic molecules.

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1

2

14

18

Which of the following pentahalides is not formed.

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NF5

PF5

AsF5

BiF5

Example of linear geometry

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XeF2

F2 and HgCl2

CdI2 AND Ag Cl3

All of the above

Which of the following state is not true with respect to copper.

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it is malleable and ductile

It is a best conductor of heat and electricity

It forms alloys easily

Moltan copper absorbed carbon dioxide

All the strong acids have very close pKas value and they appear to have nearly equal strengths in aqueous solutions. The phenomenon is called as.

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Levelling effect

Differnetiating effect

Levelling solvent

Differnetiating solvent

Iron which contains up to 1% carbon is called.

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Steel

Cast iron

Wrought iron

Pig iron

SO2 acts as

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Lewis base

Lewis acid

Botha A and B

None of above

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

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

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

The 'shape' of molecule ." Xe F6 is.

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

The energy gap between tag and eg sets in denoted by

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A-

10 Dq

Both A and B

None of above

The important condition for the formation of chemical bond is that.

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Their electron clouds should not diffuse

Both atoms should have high electron affinites.

Both atoms should have same electronegativities

The process should be accompanied by the lowering in potential energy.

The contact process is mainly used when acid is required for the manufactures of.

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Explosives

Fine chemicals

Lead accumulators

All above

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