Question # 1

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.

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

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

For an elementary reaction

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

The molecularity of the reaction is.

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1

2+

3

4

For dilute solutions colligative properties depend on.

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The number of the particles of the solute and nature of solvent.

The number of the solute particles and on their nature

The number of the solute particles and nature of solute and solvent

The number of the solute particles and irrespective of the nature of the solute and solvent.

An Ideal gas is one which obeys all the gas law at.

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Low pressure

High Pressure

Low and High temperature

All condition of pressure and temperate re

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

In an isochoric process

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Energy remains constant

Volume remains constant

Pressure remains constant

Temperature remains constant

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]

The tyndall effect was used by Zsigmondy to device.

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The ultramicroscope

The ultracentrifuge

The osmometer

Electrodialysis

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

In sodium chloride type lattice, the ratio of coordination number of cation to anion is.

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6:6

7:7

4:8

4:4

If 20 ml of 0.5 N salt solution is diluted in one litre. what is the new concentration.

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0.01 N

0.001 N

1 N

10 N

Which of the following device is used to measure the surface tension.

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Polarimeter

Viscometer

Refractometer

Stalagnameter

The units of coefficient of viscosity are.

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kg m-1 n-1

gm -1, s-1

kgm-1, min -1

None of the above

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 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 is not a correct postulate of the kinetic theory of gases.

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The molecules are in random motion

The gaseous collisions are perfectly elastic

The average kinetic energies of different gases are equal at a particular temperature.

The pressure exerted on the walls of the container is due to inter molecular forces.

Equilibrium constant Kp and Kc are related as

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Kc = Kp (RT)delta n

Kp = Kc (RT)an

Kp = (Kc/RT)delta n

Kp -Kc = (RT)delta n

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 solution has highest normality.

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1 N H2PO4

0.5 N H2SO4

6 g NaOH per 100 cm3

4 g NaOH PER 1000 cm3

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