Question # 1

Which of the following is not related to crystallography .

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Law of rational indices

Law of anymmetry

Law of constancy of interfacial angel

Henry's law

The molecule returns from the first excited triplet sate to the ground state singlet. The light emitted in known as.

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Inter system crossing

Phosphorescence

Fiuoreacence

Quenching

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

Which of the following molecules has the lowest average speed at 273 K.

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CO2

CO

CH4

O2

Which of the following health effect is caused by mercury.

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Nerve damage

Brain damage

Kidney damage

All above

Which of the following statements in not correct with respect to the important characteristics of aromatic compounds.

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They are usually cyclic compounds

They are resistant to usual addition reactions

They usually undergo substitution reactions

They are less stable

Which element out of the following can exhibit a maximum co valency of seven.

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Chlorine

Fluorine

Sulphur

Both Cl and F

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

The size of nanoparticles is between __________ nm

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100 to 1000

1 to 100

0.1 to 10

0.01 to 1

Polyethylene Glycols are used in the preparation of which tye of detergetns.

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Cationic detergents

Anionic detergents

Non ionic detergent soaps

None of above

What ASTM test for tension is designated for plastics.

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A 370

D 638

E 292

None of these

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

Which of the following disposal method is used or municipal wastes.

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Compaction

Composting

Recycling

Chemical processing

All above

Which halide of cesium will be highly ionic in nature.

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K+

Ag+

Rb+

Ca+

Among the elements A, B,C and D having atomic numbers 7,8,9 AND 12 Respectively, the element with smallest size and highest IE is.

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A

B

C

D

The entropy change accompanying any physical or chemical transformation approaches zero as T approaches zero. This statement refers to.

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Helmholtz law

Third law of thermodynamics

Second law of thermodynamics

Nernat heat theorem

The most common beta brase with a composition of 60 % copper and 40% zinc is called.

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Yellow brase

Red brase

Muntz metal

None of above

Increasing oxygen contents in oxyacids leads to.

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An increase in thermal stability

An increase in acid strength

A decrease in oxidizing power

All above

Which of the following statement is not true with respect to hydrocarbons.

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They are gaseous and liquids

They can be saturated or unsaturated

They in air by themselves alone cause harmful effects

They form photochemical oxidants

Which of the following cast iron is heat treated for ductility.

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Gray iron

Malleable iron

White iron

None of these

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Which of the following substance is a volatile metals.

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Lead

Zinc

Mercury

Sodium

The electrical resistance of stainless steels can be as much as______ time that of carbon steel.

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5

6

10-

15

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

Which of the following reacts with excess oxygen to form a normal oxide.

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Li

Na

K

Rb

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms.

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2

4

6

8

Which of the following is biodegradable pollutant.

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Domestic waste

DDT

Mercury salta

Aluminum foil

What element is added to copper to increase its strength and fatigue propertioes.

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Silicon

Aluminium

Beryllium

Copper

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

Any substance which has solidified from the liquid state with crystallization is known as

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Steel

Fibre

Glass

Asbestos

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