Question # 1

Each of the following compound is an aromatic except.

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Benzene

Naphthalene

Cyclopentadienyl cation

Cyclopentadienyl anion

What is the scaling off of a surface in flakes or layers as the result of corrosion?

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Expoliation

Corrosion fatigue

Scaping

Fretting

Which of the following statements is not correct with respect to errors in flame photometry.

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Errors rising form the phenomena developed in the Hollow cathode lamp

Background effect

Errors arising from test element itself

Spectral interference

In the Mendeleev's periodic table elements are arranged in the increasing order of their .

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Numbers of neutrone.

Atomic number

Atomic mass

Atomic volume

The rate at which a substance reacts depends on its.

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Molecular mass

Active mass

Equivalent mass

Molar mass

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

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3

1

4

2

Catenation is a process of.

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Formaton of cations

Deposition of cations

Formation of long chain of identical atoms

Formation of covalent bond

Which of the following statement is not correct with respect to hardness of water.

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It is due to soluble salts of Na

it is due to soluble salts of Ca

It is due to soluble salts of Mg

It is due to soluble salts of Fe

Acid rain is caused due to increase in the concentration of _______ in the atmosphere

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Ozone and dust

CO2 and CO

SO3 and CO

SO2 and NO2

Monomer of neoprene rubber to

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1-chloro 1,3- butadiene

2- chlro, 1,3-butadiene

2-Bromo -1,3- butadiene

2-Methyl 1,3-butadiene

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

Which of the following elements has the highest value of second ionization energy.

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Lithum

Beryllium

Boron

Magnesium

Silicon bronze contains how many percent of silicon.

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96%

3%

1 %

69 %

Which of the following is the statement of third law of thermodynamics.

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Entroy of perfectly crystalline substance is zero at T = 0

Entropy of a perfectly crystaline substance is zero at standard state conditions

Entropy and enthalpy of a substance become equal at T = 0

Free energy of a crystalline substance is zero at T = 0

Which of the following give higher fibre strength.

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Eucalyptus

Pine

Bagnasse

Sugar cane

Which of the following method is based on the solubility difference between the analyte and the unwanted components.

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Distillation

Complex formation

Electrodepostion

Precipitation

The secondary valency of Conc. CoCl3. 6NH3.

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2

4

6

8

The molar mass of an organic acids is determined by

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Depression of freezing point

Elevation of boiling point

Volumetric method

Victor Myer's method

Which of the following is the best indicator for titration of NH4OH with HCl.

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Methyl red

Methyl orange

Eosin

Phenolphthalein

Hot isostatic pressing is not a viable option if the chief criterion is

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Strength without gram growth

Lost cost

Zero porosity

Make it hard

The pH of water 7 at 25 ^oC if water is heated to 70^oC . Which of the following should be true.

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pH will decrees

pH will increase

pH will remain constant

None of these

Red colour of glass of due to the presence of

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Cu2O

CoO

MnO2

CdS

The full form of STM is

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Scanning Tunneling Microscope

Scientific Technical Microscope

Systematic Technical Microscope

SuperTensile Microscope

What is the equilibrium temperature of transformation of austenite to pearlite

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1000 F

1333 F

166 6 F

1222 F

A pH of a neutral solution at 100 ^oC when Kw = 1.0 x 10^-12

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0

7

6

7

Pick out incorrect statement.

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NF3 molecule has trigonal pyramidal structure.

It is practically incoluble in water and is only hydrolyzed, an electric spark is passed through a mixture with water vapour.

Dipole moment of NF3 is more than that of NH3

Nitrogn (III) oxide (N2O3) is an acidic oxide.

Which of the following is renewable energy source.

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Moon

Wind

Sun

Ocean

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

XeF4 is obtained, when a mixture of Xenon and fluorine in the ratio is heated in a nickle vessel at 400 ^oC

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1 : 3

5 :1

1 :20

1 :5

The type of bonding in HCl is

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Pure covalent

Polar covalent

Highly polar

Hydrogen bonding

Commercial incinerators produce.

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Smoke

CO

NOx

All above

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