Question # 1

Among the unit cells given below, which has the highest symmetry

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Monoclinic

Cubic

Hexagonal

Orthorhombic

Which of the following configuration of an ionic species represents psedue noble gas configuration.

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ns2

ns2 np6

ns2 np6 nd 10

ns2 np3

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

Of the molecules, SF4 Xe F4 and CF4 which have square planar geometry.

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SF4 , Xe f4 and CF4

SF4 only

CF4 only

XeF4 only

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

A colloidal system in which both the dispersion phase and dispersed phase are liquid is.

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Smoke

Emulsion

Whipped cream

Mist

What is clinker.

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Roasted calcareous material

Roasted argillaceous material

Roasted calcareous and argillaceous material

Roasted gypsum

The process in which ore is heated generally in the presence of air, at temperature below their melting points is called.

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Calcination

Roasting

Fourth floatation

besemerization

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

Inter halogens are of types.

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3

4

5

6

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 statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

Which one of following is paramagnetic and has the bond order equal to 0.57

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N2

H2+

O2

F2

Which of the following statement is not related to collision theory.

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Molecules must collide with each other to do a chemical reaction

Molecules must posses a minimum amount of energy

Molecules must have proper orientation

Collision theory is applicable to liquid only.

An example of acyclic polytropenoid is

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Myrcone

Buna -S

Synthetic rubber

Natural rubber

The most common beta brase with a composition of 60 % copper and 40% zinc is called.

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Yellow brase

Red brase

Muntz metal

None of above

The particle would be stationary in a lattice only at.

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273 K

0 K

298 K

373 K

Which of the following is the cause of Brownian movement of colloidal particles.

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Convection currents int he fluid

Bombardment by the molecules of the dispersion medium

Setting of dispersed phase under gravity.

Thermal gradient in the medium

Which of the following statement is not correct regarding Lewis acids and bases.

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NH3 and H2O both behaves as Lewis bases

Substances which donate a pair of electrons are called Lewis bases

All Lewis bases are also Bronsted bases

Lewis base must contain an atom having less than an octet of electron.

Which of the following methods does not give the weight average molecular weight.

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Sedimentation equilibrium

Sedimentation velocity

Light scattering

Osmotic method

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

[Ti(OH2)6]3+ gives colour

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Green

Red

Purple

Blue

Which of the following statements is not correct with respect to applications of Hammett equations.

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It develops a quantitative relationship between structure and reactivity

This equation on can be used to calculate the value of pK_a

This equation does not help to calculate the rate of some reactions

This equation has mechanistic implications

Which of the following technique is based on the absorption of light radiation.

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Spectrophotomerty

Colorimetry

NMR

All the above technique

It is known that AgCl is insoluble in HNO3 but dissolves readily in NH4OH solution .Which of the following statement is not correct.

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Ag ion reacts to form complex with NH4OH solution

The concentration of Ag ion decreases

Ionic product is less than the solubility product

Ionic product is greater than solubility product

In the metallurgy of iron, when limestone is added to the blast furnaced, the calcium ion ends up in

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Slag

Gangue

Metallic calcium

Calcium carbonate

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Which of the following is the most stable towards heat.

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CaCO3

BaCO3

Na2CO3

MgCO3

Which of the following is not a polysaccharide

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Cellobiose

Cellulose

Insulin

Amylase

Which of the following state is not true with respect to copper.

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it is malleable and ductile

It is a best conductor of heat and electricity

It forms alloys easily

Moltan copper absorbed carbon dioxide

Which of the following compounds liberates CO2 on heating.

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Li2CO3

Na2CO3

K2CO3

All liberate CO2 on heating.

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