Question # 1

carbon monoxide is harmful to human beings as it.

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Is carcinogenic

Is antagonistic to CO2

Has higher affinity for haemoglobin as compared to oxygen

Is destructive to O3

Lactic acid is a molecule which shows

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Epimersim

Tautomerism

Opical isomerism

Metamerism

Process of separating the racemic mixture into optically active isomers is known as.

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Resolution

Racemisation

Walden inversion

Epimerization

The diameter of a bucky ball is about _____________

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o

1 A

1 nm

o

100 A

10 nm

Which of the following process is involved in getting back nitrogen into atomosphere.

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Nitrification

Denitricication

Ammonification

All above

The Lewis formula of SOCl2 the total number of bond pairs and lone pairs of electrons around sulphur are.

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2,1

2 ,2

3 ,1

3 ,0

Which of the following statement is not true with respect to photo chemical reactions.

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These take place in the presence of light

Free energy of these reactions may be positive or negative

Light intensity affect these reactions

Temperature has significant affect n rate of these reactions

Which of the following properties of a system does not change in a state of equilibrium.

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Density

Pressure

Colour

All above properties

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

A molecule returns from the excited singlet state to the ground singled state with emission of light , This process is known as.

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Fluorescene

Scattering

Phosphorescence

Chemiluminescence

Hemimorphite is an example of.

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Orthosilicate

Pyrosilicate

Cyclic silicate

Meta silicate

Which of the following is a false statement.

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Halogens are strong oxidizing agent

Halogens show only (-I) Oxidation state

Hf molecules from intermolecular H-Bonds

Fluorine is highly reactive

What refers to the removal of zinc from brasses?

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Dezincification

Graphitization

Stabilization

Denitration

Turpentine is obtained from._______________

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Oak tree

Pine tree

Birch tree

Lemon tree

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Which of the following technique in current voltage technique

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Amperometry

Voltammetry

Poteatiomertry

Polarography

Which of the following materials is not suitable as adsorbent for chromatography.

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Silica gel

Activated charocal

Alumina

Calciu7m chloride

Who coined the word nanotechnology.

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Eric Drexler

Richard Feynamann

Sumio tijma

Richard smalley

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Which process of adsorption of hydrogen on palladium is known as.

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Syneresis

Occlusion

Diffusion

Erosion

Which of the following is not a property of aluminium.

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An efficient electrical conductor

A low density compared to other metals

Is amphoteric

Toxic to humans

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

Example of peseudohalonge group.

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Cyanogen

Thiocyanogen

Selenocyanogen

All above

A device which is used to measure the interracial angle is known as

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Voltmeter

Potentiometer

pH Meter

Goniometer

If the values of standrd deviations for the first and second method differ, then which of the following test helps one to know whether this difference is significant.

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Student's test

F-Test

Chi square test

Standard deviation

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

Sodium silicate is ued

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In fire proofing of wood and textiles

As a preservative of eggs

As a furniture polish

All above

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

The range of sound pressure which is painful is as

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130-140 dB

100 - 120 dB

90 - 80 dB

All above

Which of the following statement is not related with direct use of solar energy.

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It is used for space heating of buildings

It can be used to produce electrical power using photovoltaic cells

It can be used to produce hydrogen gas

It can be used start motor vehicle

With which one of the following configurations, the lowest value of first IE is associated.

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Is2, 2s2, 2p6, 3s1

1s2, 2s2, 2p5

1s2, 2s2, 2p6

1s2, 2s2, 2p6, 3s2, 3p2

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