Question # 1

The Lewis structure of which of the following does not have coordinate bond.

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SO2

HNO3

H2SO4

HNO2

The concentration required to give a signal equal to three times the standard deviation of the baseline is called.

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Sensitivity

Detection limit

Signal to noise ratio

None of the above

The formation of daughter DNA's from parent DNA is called.

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Transalation

Transcription

Reproduction

Replication

Which of the following level is an indicator of hearing loss.

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> 25 dB

< 25 dB

<20 dB

None of these

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 elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen.

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N

p

Bi

As

Which of the following cause water pollution.

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Smoke

Automobile exhausts

Aeroplanes

Silt and posticides

Which of the following is not a characteristic of dye.

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It must have suitable colour

It must be able to fix to fibre

It must be fast to wash and lights

It must be highly soluble in water

The magnitude of electron affinity depends on.

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Atomic size

Nuclear charge

Electronic configuration

All of the above

A theoretical link between quantum mechanics and thermodynamic is.

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Electrochemistry

Kinetic theory of gases

Spectroscopic analysis

Statistical thermodynamics

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

The electronegativity of phosphorus is.

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3.0

2.1

2.0

1.9

According to R, S system the correct order of priority of the following groups is .

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-CH2OH > - CHO > ----- COOH

-COOH > ------CHO > ------CH2OH

---- CH2OH -----> - COOH > -------CHO

--- COOH > - CH2OH >----- CHO

The electronegativity of the following elements increases in the order.

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C,N, Si, P

N, Si, C,P

Si, P, C, N

P, Si, N, C

Which of the following is not a component of AAS.

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Hollow cathode lamp

Burner

Detector

Tungsten lamp

The use of acids to remove oxides and acids on hot worked steels is known as

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Tempering

Picking

Machining

Sizing

Conductometry is based on

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Electric current

Electrical potential

Absorbance

Electrical conductance

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

Excluding H-atom , Hydrogen bond never involves more than atoms.

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One

Two

Three

Four

Which of the following steps in involved in the metallurgy of aluminium.

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Purification of bauxite

Electrolytic reduction of alumina

Refining of aluminum

All above

_______ is heat treatment cycle that prevents glass from harmful stress.

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Forming

Annealing

Batching

None of these

A half cell reaction is one that

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Occurs at one electrode

Goes only half way to completion

Involves a half mole of the concentration of the solution

Always oxidizes

In a standard Weaton cell the cathode is

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Cadmium amalgam

Mercury

Platinum

Carbon

The half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

Retarded reaction are those

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In which the rate of the reaction is independent of pressure

In which products are strongly adsorbed on the surface of the solid catalyst

Which are reversible under all conditions

For which G is positive

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

The mole of photon is known as

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Quantum

Eienstein

Energy Packet

None of the above

The pH of the tears is

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7.0

7.4

7.8

8.2

Concentrated aqueous sodium hydroxide can separate a mixture of.

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Al3+ and Sn2+

Al3+ and Fe3+

Al3+ and Zn2+

Zn2+ and Pb2+

The stabilization of the dispersed phase in a lyophobic sol is due to

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Liking for the dispersion medium

The surface tension of the medium

The formation of an electrical layer between the two phases

The viscosity of the medium

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