Question # 1

Monel metal is a alloy of Ni which constrains Ni uptown

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50%

60%

70%

80%

DDT is

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Biodegradable pollutant

Nodegradable contaminant

Air pollutant

An antibiotic

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

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Lithum

Beryllium

Boron

Magnesium

Which of the flowing operator combination would yield eight value equation

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d/x (sin x)

d/dx (cos x)

d /dx (sin 4x)

d /dx (cos 4x)

d/dx (e^x)

For covalent bond to form between two atoms A and B

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Transference of electrons must take place from A to B

A pair of electrons of A is shared by both A and B

A and B contribute equal no. of electrons for mutual sharing by A and B

One of the atom A or B must already have octet of electrons.

Beside the common silica based SPE particles, polymer supports are also available They have advantages over silica based SPE particles, Which of the following reason is possible.

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These are stable over a wide pH range.

These do not possesses residual silica groups

These are designed to be wettable and have high capacity than silica base particles.

All above

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

Both the elements are typical non metals.

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B & Ai

B & Si

Al & Si

Any of above

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

An emulsifier is an agents which

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Stabilizes an emulsion

Homgeneises and emulsion

Causes coagulation of an emulsion

Helps in the formation of an emulsion

The equilibrium constants Kp and Kc are related as

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Kp = Kx Pdelta n

K p= Ks/P delta n

Ks = Kp (RT)delta n

Kx = Kp (P/RT) delta n

The tensile strength of a carbon nanotube is __________ times that of steel.

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10

25

100

1000

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.

The possible sub levels in the n = 4 energy level are.

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s,p,d

s,p,d,f

s

s,p

The law of trinds was proposed by

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Dobereiner

Newlands

Lother Mayer

Chancourtois

The electromagevitiy of the following elements increase in the order

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F > Cl > O > S

S > Cl > O > F

F > O > N > C

C > O > N > F

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Solid substances consist of an ordered any of ions and solid as a whole is electrically.

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Conductor

Neurtal

Acidic

Basic

Which of the following property of liquids concern with the interval resistance to its flow.

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Refractive inded

Viscosity

Optical activity

Dipole moment

The size of iso electronic species - F- , Ne, and Na+ is affected by

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Nuclear charge (Z)

Valence principal quantum number (n)

Electron electron interaction in the outer orbital

None of the factors because their size to the same.

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 chief ore of aluminium is.

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Cryolite

Bauxite

Kaolin

Carnalite

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

A catalyst increases the rate of a reaction because.

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It provides the necessary energy to the colliding molecules to cross energy barrier

It decreases the heat of the reaction

It decreases the order of the reaction

It provides a different path of lower activation energy.

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

The forces which holds the atoms together in a molecule is called

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Ionic bond

Covalent bond

Co ordinate bond

Chemical bond

If Steel is heated to a temperature well below red heat and to then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

Relative order of acidity of HF, HCl, HBr, and HI acids is

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HCl > HBr > HI > HF

HF > HCl > HBr > HI

HI > HBr > HCl >HF

HF > HI > HCl > HBr

Potassium reacts with excess of oxygen to form

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K2O

K2O2

KO2

K2O3

Ionization potential of carbon is.

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11.2

7.8

8.1

7.3

The matrix is usually in the form of.

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Sand

Limestone

Rocks

All

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