Question # 1

Which of the following techniques is bulk technique.

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Powder XRD

Single Crystal XRD

SEM

TEM

__________ is used for fruits, vegetables and tobacco

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Potassium Chloride

Potassium Sulphate

Potassium nitraite

All above

The type of bonding in HCl is

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Pure covalent

Polar covalent

Highly polar

Hydrogen bonding

What refers to the deterioration of material by oscillatory relative motion of small amplitude between two solid surfaces in a corrosive environment?

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Stray current corrosion

Microbiologicla corrosion

Fretting corrosion

None of these

The particle would be stationary in a lattice only at.

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273 K

0 K

298 K

373 K

Which of the following properties are not related to an atom.

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An atom consists of two basic parts , a nucleus and one or more electons.

The nucleus is the central core of an atom

An electron is a heavy and negatively charged particle.

The nucleus itself consiste of two particles.

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

The proper number of significant figures in the number 0.0780 is.

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3

1

4

2

Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution.

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CH3COOH

NH+4

H2SO-3

H4P2O7

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

The following ceramic product is mostly used as pigment in paints.

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TiO2

SiO2

uo2

ZrO2

Which of the following process is involved in the purification of crude metals.

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Liquation process

Oxidation process

Distillation process

Electro refining

Which of the following is not chemical characteristics of water.

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pH

COD

BOD

Colour

Which of the following has highest ionization energy.

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Oxygen

Argon

Barium

Caealum

Which of the following can act both as a Bronsted acid and a Bronsted base.

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Na2CO3

OH-

HCO3-

NH3

Nitric acid is used in the manufacturing of.

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Dyes

Drugs

Artificial silk

All above

The units of surface tension in SI system are

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Joule m-1

Newton m-1

Erg cm-1

Dynes cm-2

What letter suffix steel identification means that it is steel with boron as an alloying elements.

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xxL xx

xxBxx

xxHxx

xxKxx

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

The rate constant for 3rd order reaction has the dimentions of.

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mol-2 s-1

I2 mol-2 s-1

mol I -1 s-1

I-1 mol -1 s-1

An indicator for an acid base titration is a

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Weak acid

Weak base

Strong acid

Strong base

Both A and B

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

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Pentagonal bipyramidal

Regular octahedral

Distorted octahedral

Square planar

Which of the following is a planar molecule.

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Acetone

Formic acid

Acetic acid

All above

Which one of the following ionsis colourless.

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Cu+

Ni2+

Co2+

Fe3+

Major ingredients of traditional ceramics

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Silica

Clay

Feldspar

All

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.

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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.

The phenylamine molecule is too large to capture hydrogen ion easily

Phenylamine is much less soluble is water than is ammonia

The benzene ring has a tendency to increase the acidity of its substituents.

Colloids can be purified by

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Peptization

Coagulation

The Breeding are method

Dialysis

Primary structure of protein refers to

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Amino acid sequence

Arrangement of peptide chains

Orientation of amino acids

Whether is has a or b helix in space structure.

Which of the following statement is not related with high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

Which of the following element has six electrons in the valance shell but cannot exhibit a maximum co valency of six.

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Sulpher

Oxygen

Salenium

Both A and B

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