Question # 1

The chrome molybdenum steels contain how many percent of molybdenum

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0.10

0.20

0.30

0.40

The electronic configuration of some elements are given below. The element with highest electron affinity is

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1s2, 2s2, 2p3

1s2, 2s2, 2p4

1s2, 2s2, 2p5

1s2, 2s2, 2p6

A mixture of weak acid and its salt is.

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Alkaline buffer

Acidic buffer

Neutral buffer

All of above

The action of all the relations of all the organism to their environment is called

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Biology

Botany

Ecology

Archiology

The electronegativity of phosphorus is.

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3.0

2.1

2.0

1.9

"Acids are substance whose aqueous solutions turned blue litmus red and tasted sour" stated by

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Davy

Liebig

Boyle

Rouelle

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

Is an instate able colourles gas with a sticky sweet odor and is extremely toxic.

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B2 H6

B4 H10

B3 H9

B6 H10

The types of coordinate compounds.

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Labila

Inert

Both A and B

None of above

Which of the following property has a higher value for trans isomer as compared to cis isomer.

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Density

Dipole moment

Melting point

Boiling point

Which of the following statements is not correct regarding electromagnetic spectra?

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The frequency of microwave is less than uv

The velocity of X-rays is more than uv

Cosmic rays have shorter wave length than radio waves.

The frequency of uv is greater than visible rays.

Coulometry is based on the measurement of

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Electrical current

Electrical potential

Electrical conductance

Dielectric constant

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

The branch of physics that mathematically describes the wave properties of electron in atomic is called.

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Statistical Mechanics

Quantum Mechanics

Chemical statistics

Thermodynamics

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

The substance that can form the glassy non-crystalline structure is called.

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Stabilizers

Fluxes or modifiers

Formers

None of these

Chlorine is used in

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Sterilizatin of water

Extractionof gold

Bleaching of cotton

All above

AlCl3 fumes in air because of.

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Hydrolysis

Dehydration

Hydration

Oxidation

The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as.

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Kinetics

Photo chemistry

Surface chemistry

Catalysis

Which one of the following statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

Which of the following parameter is not involved in calculations based on Born Haber Cycle.

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Ionization enthalpy

Electron gain enthalpy

Electronegativity

Bond dissociation energy

Which of the following is not an intensive property.

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Melting point

Refractive index

Entropy

Density

The oxidation state shown by phosphorus is.

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- 3

+ 3

+ 3 and +5

-3 ,+ 3 and +5

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

Organic substance responsible for the smell of the Flowers etc are grouped together in chemistry as.

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Perfumes

Terphenoids

Flavonoids

Alkaloids

'A line, a point or a plane about which a symmetry operation is performed, is known as.

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Symmetry operation

Symmetry element

Reflection

Inversion

Which of the following is the weakest base.

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KOH

NaOH

LiOH

RbOH

Xe reacts directly with

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O2

Cl2

F2

Br2

Which element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

What ASTM test for compression is designated for plastics.

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D 638

D 695

D 790

D 732

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