Question # 1

The addition of As to Ge makes the latter a

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Metallic conductor

Ionic conductor

Intrinaic conductor

Extrinsic semiconductor

The basic strength of hydrides of group 15 elements very in the following order.

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NH3 > PH3 > AsH3 > SbH3 >BiH3

PH3 > NH3 > AsH3> SbH3 > BiH3

BiH3> NH3 >PH3 > AsH3 > SbH3

NH3 > PH3 > SbH3 > AsH3 > BiH3

The diameter of a bucky ball is about _____________

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o

1 A

1 nm

o

100 A

10 nm

Copper occurs in nature as.

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Native

Combined

Both native and combined

None of the above

The large increase in the rate of a reaction on rise in temperature is due to.

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The lowering of activation energy

The decreases in mean free path

The increase in collision frequency

The increase in the number of molecules having more than the threshold energy

The number of hydrogen bonds boding A _____ T pair is

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1

2

3

4

The photoelectric effect is the ejection pf electrons from the surface of metal when light falls on it. Which of the following statements is not correct about the phenomenon.

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The kinetic energy of photo electron depends upon the frequency of the incident radiation

Electrons are ejected only when the frequency of light exceeds a certain threshold value

The higher the energy of the photon greater the kinetic energy of the ejected electron.

The threshold frequency of all the metals is same.

Nitrogen (N2)) is relatively unreactive because.

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Its electronegativity is high

Its dissociation energy is large

Its atomic radius is small

It is the first element of group 15

What ASTM test for shear strength is designated for plastics.

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D 732

D 790

D 695

D 638

Granulated sugar contains _____________% sucrose

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80

99.30

60

90

The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure..

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Halides

Hydrates

Clathrates

All of above

Which of the following is an allotrops of hydrogen.

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0- H2

P-H2

Both A and B

None of these

The _________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated group

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Ligand

Donor

Coordination

Oxiation

By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly

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Hard

Brittle

Tough

Soft

Which of the following disposal method is used or municipal wastes.

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Compaction

Composting

Recycling

Chemical processing

All above

During sintering densification is not due to

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Atomic diffusion

Surface diffusion

Bulk diffusion

Surface tenstion

A type of a chemical bond which is formed by the mutual sharing of electrons between combining atoms of the same or different elements is called.

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Ionic bond

Covalent bond

Co ordinate Covalent bond

Metallic bond

Carbon tetra chloried has no net dipole moment because of.

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Its planar strcture.

Its regular tetrahedral structures.

Similar sizes of carbon and chlorine atoms

Similar electron affinities of carbon and chlorine.

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

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Smoke

Emulsion

Whipped cream

Mist

The device that convert the chemical energy of fuel directly into electrical energy is called.

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Galvanic cell

Electrolytic cell

Fuel cell

Concentration cell

The point group of XeOF4 is.

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C6v

C4h

D4h

D2h

Noble gases are used in discharge tubes to give different colours. Raddish orange glow is due to.

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Ar

Ne

Xe

Kr

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

The aluminium salt commonly used to stop bleeding is

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Aluminium sulphate

Potash Alum

Aluminium chloride

Aluminium fluroide

Carbohydrates are characterized by the presence of.

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Hydroxyl group

Carbony group

Asymmetric carbon

All of these

During reaction of copper with aqueous solution of silver nitrate

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Silver atoms are reduced

Cu2+ ions are reduced

Silver ions are reduced

No³ ions are reduced

Beer's law is followed in

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Flame photometry

Atomic absorption spectrophotometry

Mass spectrometry

Potentiometry

A drop of a liquid acquires spherical shape because of.

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Its viscous nature

Capillary action

The tendency to acquire minimum surface are

Its shape

The particle would be stationary in a lattice only at.

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273 K

0 K

298 K

373 K

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Which of the following properties of a system does not change in a state of equilibrium.

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Density

Pressure

Colour

All above properties

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