Question # 1

The ration of thermal conductivity of silver to that of a carbon nanotube is.

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100 : 1

1 :100

10:1

1:10

Which of the following elements is most electropositive.

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C

N

O

Be

Linear molecules have ____________ axis of rotation

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C1

C2

C

C3

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

The presence of which of the following in drinking water is responsible for mottling of teach.

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Mercury

Iodine

Chlorine

Flourine

Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.

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Dialysis

HPLC

FPLC

TLC

Consider the coordination compound Na2[Pt(CN)4] the Lewis and is

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[Pr(CN)4]2

Na+

Pt

Pt2+

The force responsible for dissolution of ionic compounds in water are

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Hydrogen bonds

Ion dipole forces

Ionic bonds

Van Der Waal forces

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

Which of the following has the highest melting poing.

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NaCl

Li Cl

KCl

Rb Cl

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

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Period 1

Period 2

Period 7

Period 6

Which of the following potassium fertilizers are more useful for horticultural crops tobacco and potatatoes.

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KNO3

KCl

HNO3

H2SO4

Which of the following substance is released into environment in the nuclear power plants.

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Iodine -131

Argon - 41

Sr-90

Cs- 137

All above

Polyethylene Glycols are used in the preparation of which tye of detergetns.

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Cationic detergents

Anionic detergents

Non ionic detergent soaps

None of above

The IUPAC suffix used for ______ NC group is

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Cyanide

Isocyanides

Carbylamines

Nitrite

Which among the following is least soluble in water.

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NaF

LiF

KF

CsF

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

Which of the following is not a characteristics of terpenoids.

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They are pleasant smelling liquids

They are steam volatile

They are nitrogenous bases

they are insoluble in water

Which parameter of a chemical reaction will change with the use of a catalyst.

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Delta F, change in free energy

Delta S, change in entropy

Delta E , change in internal energy

K, the rate constant

Deviation in a particular measurement is the difference between the measured value and the average value The arithmetic mean of the different deviations observed in several measurements of the same quantity is known as.

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The standard deviation

The average deviation

Relative mean deviation

variance

A compound with an congruent melting point decomposes on heating into.

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A liquid of the same composition as the solid

A new solid phase and a solution with a compositional from that of the solid phase

A new solid phase and a solution with the same composition as that of the solid phase

A solution of fixed composition

If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step

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22 Kj

-22 kj

52 kj

-52 kj

Group IV A consist elements.

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3

4

5

6

Which of the following process is a source of nuclear pollution.

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Uranium mining

Uranium processing

Reactor waste

All above

Which of the following techniques involves ion exchange phenomenon.

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Size exclusion chromatography

Ion exchange chromatography

GLC

HPLC

Strong field ligands such as CN

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Usually produce high spin complexes and small crystal field splitting

Usually produce low spin complexes and small crystal field splitting

Usually produce low spin complexes and high crystal field splitting

Cannot form low spin complexes

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

If there are only two components in a solution with mole fraction X_Aand X_Bthen which of the following relation is correct.

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X_A + X _B = 0

X _A + X _B > 1

XA = XB < 1

XA = 1 - XB

Which of the following statement is not correct regarding the constant R . and in ideal gas equation PV= nRT

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Its value in independent of temperature

Its value is independent of pressure

In SI Units its value is 8.314 K^-1 mol^-1

It is called the universal gas constant per molecule.

The emission of light characteristics of metal and correlation of intensity of the light emitted with concentration of that metal forms the basis of.

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Roman spectroscopy

IR spectroscopy

Flame photometry

Rotational spectroscopy

Which of the following is a planar molecule.

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Acetone

Formic acid

Acetic acid

All above

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