Question # 1

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

In group theory the triple degenerate set is denoted by

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eg

t2g

e2g

tg

Sodium Tetra borate is used

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As alkaline buffer in dying & bleaching process

In manufacture of opticl glass

in enameling and making glaze

All above

Which of the following type of polymerization is used for the preparation of synthetic rubber.

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Free radical

Zingler natta

Cationic

Anionic

The rise of a liquid in capillary tube is due to.

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Osmosis

Diffusion

Surface tension

Viscosity

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Pick out incorrect statement regarding HF

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It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols

It is used in making ASIF3 and synthetic cryolite

Aqueous HF is used for etchine glass

HF does not react with B2O3 even in presence of conc. H2SO4

What is the scaling off of a surface in flakes or layers as the result of corrosion?

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Expoliation

Corrosion fatigue

Scaping

Fretting

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

What types of bonding occurs in d-block elements.

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Ionic

Covalent

Metallic

Both B and C

Out of seven crystal system, how many can have body centered unit cell.

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3

4

2

7

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

Which of the following statements not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

Among alkali metals, the least metallic element is.

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Li

Na

Rb

Cs

Which of the following statements is not true for both B and Al

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They burn in oxygen to give oxides at high temperature

Their halides are Lewis acids

They combine with nitrogen to form nitrides

They react with HCl to form chlroides.

Which of the following is not an alum.

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KAI (SO4)3 12 H2O

NaAI (SO4)2 12 H2O

NH4Fe (SO4)2 12H2O

FeAl (SO4)2 . 12 H2O

Which of the following pose threat to historical monument Taj.

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Floods in Yamuna river

Temperature mediated spoilage of marble

Air pollutants from Mathura refinery

Weathering of marble

When CH3COOH is titrated against NaOH the pH as the equivalence point is.

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7

> 7

o

>7

6.8

Which of the following statement is not related to applications and limitations of first law of thermodynamics.

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This law explains why chemical reactions proceed to completion

It is silent about the source of heat

It is silent about the direction of heat

It does not tell us about the reversible process.

For assciated liquids, the value of d/M n x 10⁸ should be (where d is the density, M is the molar mass and n is the coefficient of viscosity)

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Zero

Infinte

Higher than 70

Less than 70

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

Which of the following agrochemical acts as pollutant.

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Fertilizers

Weedicides

Herbicides

All above

Bryllium salts on hydrolysis give.

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Basic solutions

Acidic solutions

Neutral solutions

Amphoteric solutions.

Metal are

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Hard

Ductile

Malleable

All

Keeping in view the periodic law and periodic table, suggest which of the following elements should have maximum electronegative character.

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Oxygen

Nitrogen

Fluorine

Astatine

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

The deficiency of which vitamin leads to beri brainteaser

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Thiamine

Riboflavin

Pyridoxine

Asorbic acid

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

The expected specific waste of food industry is.

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Meats

Nuts

Fats or Oils

All above

Which of the following equations represent linear free energy relationship.

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Hammett equation

Taft equation

Helmholtz equation

Differential equation

Which of the following techniques is involved in purification of organic compound.

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Distillation

Sublimation

Solvent extraction

All above

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