Question # 1

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

Which of the following is not a true characteristics of a catalytic reaction.

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The amount and chemical composition of the catalyst remains unchanged after the reaction

The catalyst does not intiate a chemical reaction

The reaction in which product also act as catalysis are called autocratically reactions.

The catalyst shifts the equilibrium position of a reaction in a favorable direction

How many planes of symmetry are present in benzene.

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1 plane

3 planes

5 planes

7 planes

Which of the following electrolytes will be most effective in the coagulation of arsenic sulphide sol.

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NaNO3

AI PO4

MgSO4

K4[Fe(CN)6]

Which of the following statement is not related to applications and limitations of first law of thermodynamics.

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This law explains why chemical reactions proceed to completion

It is silent about the source of heat

It is silent about the direction of heat

It does not tell us about the reversible process.

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 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

Total pressure exerted by a mistress of two or more than two gases in a definite volume as any given temperature is equal to the sum of partial pressures which each gas would exert, if it occupied the same volume alone, at the same temperature This is a statement.

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Boyle's law

Charle's law

Graham's law

Dalton's law

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

Which of the following statement is correct.

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The wavelength of phosphorescence is less than the wavelength absorbed

Teh transition from T₁ to S₀ without the emission of light is called phosphorescence

The combination CO2 and water in plants, in the presence of chlorophyll, is an example of bioluminescence.

Population inversion is a necessary condition for laser action

Which of the following statement is not related to MOT

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Atomic orbitals lose their identities

MOTgives as idea of denationalization

MOT uses all the orbitals and elections

It treated bond as purely covalent

The rate constant of a reaction depends on

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Concentration of reactants

Concentration of products

Temperature

Time

Which of the following statement is not correct with respect to group theory.

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Two elements of a group combine to form a third element of a group

An element combines with itself to form another element of the group.

Each element of the group obey associative law of combination

Each group element has no reciprocal

Which of the following statements is not correct regarding the structure of DNA.

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It has a double helix structure.

There are hydrogen bonds in its structure

Unlike RNA there is no fixed ratio of bases in DNA

The code for protein synthesis is given by the sequence of bases in DNA

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 molarity of a 500 mL solution containing 4 g NaOH

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0.1

0.2

0.3

0.4

A 10% solution of sucrose contains 10 g of sucrose in how much volume of the solution.

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10 mL

100 mL

1000 mL

1 mL

Which of the following is not a colligative property.

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Elevation of B.P.

Depresaion in F.P

Viscosity

Osmotic pressure

The glow of the yellow phosphorous as a result of slow oxidation in air is called.

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Chemiluminescene

Luminescence

Biolumineacence

Photolysis

Which of the following statements is not true with reference to ionic conductors.

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Ionic conductance is due to movement of the ions

It involves the transfer of matter

It involves oxidation reduction reactions

It decreases with rise in temperature.

The extinction co efficient has the units.

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cm2 mol -1

cm3 mol-1

mol cm-3

mol cm-1

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