Question # 1

Which of the following techniques involve gas as the mobile phase.

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HPLC

GLC

TLC

Paper chromatography

What typical penetrator is used in Brinell hardness test

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10 mm ball

1.6 mm diameter ball

20^o needle

None of these

What refers to the application of any process whereby the surface of steel is altered so that it will become hard.

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Caburizing

Case harden zing

Ammealing

Surface hardening

The reagent which can react with 1- chlorobutane to give substitution product is

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Al Cl3

KOH -CH3OH

NaCN

Mg/ether

Which of the following compounds cannot be a monomer.

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CH3-CHOOH -CH2OH

NH2 -CH2-NH2

CH3-CH2-NH3

NH2-CH2-CH-CH2 -NH2

CH3

In hydrogen bonding a hydrogen atom is bonded to which of the highly electronegative atoms.

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N

O

F

N,O,F

Which of the following statement is not correct with respect to limitations of Hammett equation.

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It is only applicable to aromatic systems

Only applicable to aliphatic systems

It is not valid for m-substituent

To complete transfer of a shared pir of electrons to one of the atoms joined by a double or triple bond at the requirement of an attacking reagent is known as.

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Inductive effect

Resonance effect

Eletromeric effect

Stark effect

The reverse of photo chemical reaction is called.

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Phosphorescence

Chemiluminescence

Fluorescence

Photscnaitization

The ease of hydrohalogenation of alkyl halide with alcoholic KOH is.

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3^o > 2^o > 1^o

3^o < 2_o <1^o

3^o > 2^o < 1^o

3^o < 2 ^o > 1^o

Electronegativity of oxygen is.

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2,5

3,5

2,4

2.1

Main constituent of all inorganic matter

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Carbon

Silicon

Tin

Lead

The expected specific waste of paper and allied products industry is.

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Chemicals

Paper and fibre residues

Links

All above

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called.

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

The three dimensional silicate anion (Si2O5^2-)n is present in

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Beryl

Silica

Asbestos

Clays

Each of the following when present at para position decreases the acidic strength of phenol except.

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-NH2

-Cl

CH3O-

CH3-

The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds.

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1/3

1/6

1/8

1/16

C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is

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Recemic mixture

Meso isomer

Dextoroisomer

Levoisomer

What is a process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by a rapid cooling of the surface?

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Cyaniding

Nitriding

Flame hardening

Stability

Which of the following is capable of shown g optical isomersm.

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CH3COCOOH

CH3CHOHCOOH

Botha a and b

All of these

Which of the following is an alloy of copper

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Brass

Bronze

Monel metal

All

The first step of formation of sugar is

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Extraction

Washing

Cutting

Clarifying

Amorphous boron on burning in air form

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B(OH)3

Only B2O3

Only BN

Mixture of B2O3 and BN

Which of the following is not a characteristic of phthalocyanine dyes.

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They are metal complex

the are insoluble in water

They have porphin nucleus

They are used in photographic plates

The group H steels can be used n what temperature range.

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600^oC to 1100 ^oC

1000 ^oC to 1500 ^oC

1100 ^oC to 2000 ^oC

200 ^oC to 800 ^oC

Which of the following gas form weakly acidic sulphurous acid

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SO2

SO3

NO2

NO

The major role of Flurospar which is added in small quantities in the electrolytic reduction alumina dissolved in fused cryolite is.

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As a catalyst

To make the fused mixture very conducting

To lower the temperature of the melt

To decreases the rate of oxidation of carbon at the anode

Which of the following trace elements may be present in the particulate materials.

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Cadmium

Nickel

Mercury

Lead

All of the above

How much amount of NaOH is required to prepare 100 mL of 1 N solution.

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80 g

4 g

40 g

zero

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