Question # 1

In the long form of periodic table, elements are arranged according to.

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Increasing atomic number

Decreasing atomic number

Increasing atomic mass

Decreasing atomic mass

Which of the following technique is the application of voltammetry at a fixed potential to detect changes int he currents as a function of the concentrating of the analyte

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Amperometry

Coulometry

Polarography

Potentiomertry

What is the effect of manganese in cast iron.

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^{To affect the machinability ductility and shrinkage depending on form}

To reduce hardness by combining with sulfur below 0.5% and increase hardness above 0.55

To dioxide molten cast iron

Have no effect

Which of the following technique involves the bonding of hydrophobic functional group to solid particle, surface and acts as extracting phase

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Liquid phase extraction

Solid phase extraction

Electrophoresis

Gel electrophoresis

Boron and aluminum halides are electron deficient compounds in this respect. they act as.

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Lewis acid

Lewis base

Oxidizing agent

Reducing agent

Indicate the false statement about corrosion.

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Plastics and ceramics are immune to many forms of corrosion because they are not good conduction of electricity.

The corroded member in a corrosion cell is the cathode

Passivity is a prerequisite for the corrosion protect on many metals

None of these

An optically active compound

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_{Must contain at least favour carbons}

When in solution rotate the plane of polarized light

Most always contain an asymmetric carbon atom

In solution always give negative reading in polarimetre

In group 17, the element with highest first ionization enthalpy belongs to.

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Period 1

Period 2

Period 7

Period 6

Among LiCl, BeCl2, BCl3, and CCl4 the covalent bond character follows the order.

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LiCl < Becl2< Bcl3 < CCl4

LiCl > BeCl2 < BCl3<CCl4

LiCl< Becl2 < BCl3 < CCl4

LiCl > Becl2 > BCl3 < CCl4

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

Which of the following does not represent Lewis base.

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Pyridine

NaNH2

PCl3

NaOH

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

Not a major contributor of engineering ceramics

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SiC

SiO2

Si3N4

BH3

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.

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Group 1

Group 18

Group 4

Group 14

Which of the following cause water pollution.

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Smoke

Automobile exhausts

Aeroplanes

Silt and posticides

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

The common oxidation state of lanthanides is.

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+3

+2

+1

+4

In a system of designating wrought aluminum alloys a sour digit number is used what does the first digit indicate.

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The purity of aluminum

The identity of the alloy

The alloy group

All of above

Molecule of oxygen is

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Diamagnetic

Paramagnetic

Both A and B

None of above

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

Which of the following elements forms maximum number of compounds.

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Carbon

Silicon

Hydrogen

Fluorine

The depolarizer used in dry cell batteries in.

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NH4Cl

MnO2

KOH

Na2PO4

When HCl is titrated against NaOH , the pH at the equivalence point is.

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zero

> 7

< 7

14

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

Which of the following sets of quantum number is possible for an electron in a 4f orbital.

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n = 4,l = 3, m = 4, s = +1/2

n = 4, l= 4, m = +4 , s = +1/2

n = 4, l = 3, m = +1, s = -1/2

n = 4, l = 4, m = +1 , s = -1/2

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Sugar and common salt in a mixture can be separated through then process of.

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Sublimation

Distillation

Ion exchange

Crystallization from solution in ethanol

All steroids on heating wish solenium give

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phenanthrene

Cholesterol

Diels hydrocarbon

Isoprene

Which of the following has the highest lattice energy

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LiCl

NaCl

KCl

CaCl

The width of a typical DNA molecule is _______nm

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1

2

5

10

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