Question # 1

Which of the following type of lattice has maximum numb of atoms per unit cell.

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Simple cubic

Body centred cubic

Face centred cubic

All of them

The tyndall effect was used by Zsigmondy to device.

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The ultramicroscope

The ultracentrifuge

The osmometer

Electrodialysis

Which of the following will be most effective int he coagulntion of

Fe (OH)3 sol.

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NaCl

MgSO4

AlCl3

Mg3 (PO4)2

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.

The equivalent conductance (^) and molar conductance ( ^ m ) of BaSO4 are related as.

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^ = ^m/2

^/2 = ^m

^ = ^m

^ = ^m/4

The flow of solvent into a solution when two are separated by a semi -permeable membrane is called.

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Mixing

Effusion

Diffusion

Osmosis

The degree of dissociation of weak acid increases with.

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Decreasing pressure

Increasing pressure

Increasing concentration

Decreasing concentration

The rate constant for 3rd order reaction has the dimentions of.

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mol-2 s-1

I2 mol-2 s-1

mol I -1 s-1

I-1 mol -1 s-1

The correct order of acidic strength is.

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HF < HCl< HI < HBr

HI <HBr < HCl < HF

HI < HBr < HF < HCl

HF < HCl < HBr < HI

Which of the following methods gives the number average molecular weight of a polymer.

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Light scattering method

Osmotic method

Sedimentation equilibrium method

Viscosity method

When a strong beam of light is passed through a colloidal solution, the light will

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Be reflected

Be scattered

Pass unchanged

Be dispersed

In C4-axis of rotation, an object in rotated through an angle of.

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120^o

180^o

100 ^o

90^o

The angle between corresponding planes forming the external surfaces of the crystal remains constant for a given substances This is known as.

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Steno's law

Henry's law

Bragg law

Pascal law

Branch of chemistry that deals with the basic principles governing energy changes during various processes is called.

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Wave mechanics

Chemical kinetics

Chemical thermodynamics

Electro chemistry

Colloids can be purified by

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Peptization

Coagulation

The Breeding are method

Dialysis

The SI unit of pressure is Pascal it is define da sa force per unit are of 1N/m2 one atmosphere of pressure is equal to.

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760 mm of Hg

1 bar

101 k Pa

760 torr

All are correct

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 statements is not related with chemical equilirbium.

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The properties of the system become constant

The equilibrium can be approached from either direction

The chemical equilibrium is static is nature

A catalyst can hasten the approach towards equilibrium

Which of the following characteristics of adsorption is wrong.

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Adsorptoin on solids is reversible in nature

Adsorption, in general increase with increase in temperature.

Adsorption is generally selective in nature.

Both enthalpy and entropy of adsorption are negative

Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.

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17

18

34

35

At extremely low pressures, the van der Waals equations for one mole may be written as.

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PV = RT + Pb

PV = RT

PV = RT - a/V

(P +a) (V-b) = RT

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