Question # 1

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

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

The pH of water 7 at 25 ^oC if water is heated to 70^oC . Which of the following should be true.

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pH will decrees

pH will increase

pH will remain constant

None of these

Which of the following statement is not related with high quantum yield reasons.

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Formation of reactive intermediates which may act as catalyst

The active molecules may collide with other molecules and activates these molecules.

The reaction may be exothermic and heat evolve may activate other molecule

The primary photo chemical process may be reversed

The reciprocal of the coefficient of viscosity in called.

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Density

Specific gravity

Fluidity

Conductance

The pKa of an acid having ionization constant 1 x 10^-5 is

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-5

5

9

-9

The temperate of a gas below which only the gas cools when allowed to expand is know as.

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Inversion temperature

Ideal temperature

Critical temperature

Joule Thomaon temperatu4re

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

The quantum yield of a Photo chemical reaction in

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Always less than unity

Always equal to unity

Always greater than unity

Can have any value > 0 depending on the reaction

The rate constant of a reaction has same units as the rate of the reaction The reaction is of.

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Second order

First order

Three order

Zero order

The azimuth or angular quantum number (i) determines the number of sob shells in a given shall. the allowed values of l for a given value ffor n are.

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1.2.3.......................

1,2,3 ..................(n-1)

0.1.2.3................(n-1)

2,4,6,..............(n-2)

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 substance has the greatest lattice energy.

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CuBr

MgO

KI

NaF

Retarded reaction are those

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In which the rate of the reaction is independent of pressure

In which products are strongly adsorbed on the surface of the solid catalyst

Which are reversible under all conditions

For which G is positive

The equivalent conductance of a 1 N solution of an electrolyte is nearly

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The same as its specific conductance

10³ times more than its specific conductance

10-3 times its specific conductance

100 times its specific conductance.

The compound contains two types of X and Y its crystal structure is a cubic lattice with X-atoms at the corners of the unit cells and Y-atom t the body centre, The simplest formulae of this compound is.

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X2Y

XY

XY2

X8Y

The number of degrees of freedom and number of components for a system of containing undissolved salt , in equilibrium with water vapor are.

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2,2

3 , 2

1 , 1

1 , 2

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

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.

The number of phases of mixtures of four gases enclosed in a container is

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1

4

4-1

zero

The relative lowering of vapour pressure of a solution on the addition of non -volatile solute.

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Is equal to the mole fraction of solute

Is equal to the sum of the mole fraction of the solute and solvent

Depends upon the nature of the solute

Depends upon the mole fraction of the solvent

Which of the following should have the largest dipole moment.

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Carbon tetrachloride

Cis-stibeue

Trans-atibeue

Cis-dichlorocthylene

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