Question # 1

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 half life period of any first order reaction.

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Is half the specific rate constant

Is independent of the initial concentration

Is always the same whatever the reaction

Is directly proportional to the initial concentration of the reactant

The migration of positively charged colloidal particles, under an electrical field , towards the cathode is called.

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Cataphoresis

Electroamosis

Sedimentation

Electrodialysis

For an elementary reaction

2A + B ------------------- C + D

The molecularity of the reaction is.

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1

2+

3

4

The entropy change accompanying any physical or chemical transformation approaches zero as T approaches zero. This statement refers to.

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Helmholtz law

Third law of thermodynamics

Second law of thermodynamics

Nernat heat theorem

Which of the following reactions have small enthalpy change.

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NaOH with HCl

NaOH with CH3 COOH

HCl with NH4 OH

None of these

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.

In proper rotation (Cn) an object is rotated through an angle of.

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a/n radians

2n/n radians

3n/n radians

4n/n radians

How many planes of symmetry are present in benzene.

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1 plane

3 planes

5 planes

7 planes

The molarity of a 500 mL solution containing 4 g NaOH

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0.1

0.2

0.3

0.4

One ppm solution of NaOH Contain 1000 mg of the solute per how much of the volume of the solution.

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1000 mL

100 mL

10 mL

1 mL

In a standard Weaton cell the cathode is

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Cadmium amalgam

Mercury

Platinum

Carbon

Which of the following regions of the spectrum would be used to determine the structure of the crystalline solids.

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Microwave

X-rays

Visible

Infrared

During the titration of weak acid against NaOH the conductance of the solution after the neutralization point.

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Is constant

Decreases

Varies irregularly

Increase

The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as.

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Kinetics

Photo chemistry

Surface chemistry

Catalysis

The emission of light in a biological reaction in known as.

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Fluorencence

Phosphoreacence

Biolumineacence

Phtolysis

The number of moles of solute dissolved in 1000 gram of the solvent is called

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Formality

Molality

Molarity

Mole fraction

Which of the following enthalpies is always negative.

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Enthalpy of melting

Enthalpy of combustion

Enthalpy of solution

Enthalpy of formation

Which of the following statement is not correct regarding the stern theory of charge on colloidal particles.

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The colloidal particle has a charge distribution at its surface.

In the immediate vicinity of the colloidal particles there is an excess of counter ions

The greater the concentration and charge of ions in the diffused electrical double layer. the larger is the thickness of the layer

At large distance from the colloidal particles, the concentration of co-ions and counter ions are almost equal

The point group of XeOF4 is.

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C6v

C4h

D4h

D2h

Which of the following process always involve the decrease in oxidation number.

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Hydrolysis

Elecomposition

Oxidation

Reduction

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