Question # 1

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

The lowest K.E. for an electron is three dime national cubic box is given by

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h²/ 8m^a

3h² / 8 ma²

9h²/ 8ma²

16h² / 8ma²

In the process of electrosmosis

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Colloidial particles move towards the electrodes

Both colloidal particles and dis persons medium move

Only dispersion medium moves to carry the current

Positively charged colloidal particles move, but negatively charged particles remain stationary

Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called.

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

The stabilization of the dispersed phase in a lyophobic sol is due to

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Liking for the dispersion medium

The surface tension of the medium

The formation of an electrical layer between the two phases

The viscosity of the medium

The units of surface tension in SI system are

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Joule m-1

Newton m-1

Erg cm-1

Dynes cm-2

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

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

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Monoclinic

Cubic

Hexagonal

Orthorhombic

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

Concentration polarization arises because of the

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Different concentrations of solutions in the two half cells

Changes in the concentration of electrolyte around the electrode from bulk concentration

Reversible nature of the cell

Variation in temperature during measurements

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 makes the motion of perpetual motion machine a physical impossibility.

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First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

The Boltzmann law

Which of the following will have the largest pH?

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O.1 N HCl

0.1 N CH3COOH

0.1 N NaOH

0.01 N NaOH

Layer of the C -atom in graphite are hold together by

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Covalent bonds

Free electrons

Ionic bond

Van Dar Waals forces

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

Which of the following compounds does not show dipole moment.

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CH3OH

HBr

CCl4

CHCl3

When two bodies have equality of temperature with a 3rd body they in turn have equality of temperature with each other. This is a statement of.

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First law of thermodynamics

Zeroth law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

Which of the following specie is stronger acid than formic acid, HCOOH, in aqueous solution.

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CH3COOH

NH+4

H2SO-3

H4P2O7

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

Colloids can be purified by

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Peptization

Coagulation

The Breeding are method

Dialysis

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

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