Question # 1

A molecule returns from the excited singlet state to the ground singled state with emission of light , This process is known as.

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Fluorescene

Scattering

Phosphorescence

Chemiluminescence

Which of the following statements is not relevant to the Plank's quantum Theory.

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Radiant energy is not absorbed or emitted continuously

Radiant energy is emitted or absorbed in the form of small packets of energy.

The quantum oflight energy is called photon

The energy associated with photon of radiation is directly proportional to the wavelength.

The normality of 2.3 M H2SO4 solution is.

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0.46 N

0.23 N

2.3 N

4.6 N

For a chemical reaction A ___________ produce, the rat of the reaction doubles when the concentration of A is increased by 4 times the order of the reaction is.

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0

1

1/2

4

Which of the following compounds does not show dipole moment.

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CH3OH

HBr

CCl4

CHCl3

According to the Debye-Huckel theory of strong electrolytes, and ion moving in an atmosphere of oppositely charged ions experience a drag This effect is known as

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Aaymmetric effect

Electrophoretic effect

Inter ionic effect

Concentration effect

At extremely low pressures, the van der Waals equations for one mole may be written as.

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PV = RT + Pb

PV = RT

PV = RT - a/V

(P +a) (V-b) = RT

Which of the following system has low as well as upper consolute temperature.

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Nicotine - water

Aniline -water

Triethlylamine -water

Phenol -water

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 temperature at which the vapour pressure becomes equal to external pressure is called.

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Saturation point

Critical temperature

Consolute temperature

Boiling point

For one mole a gas, the total kinetic energy is equal to.

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2/3 Rt

3/2 RT

2/3 kT

3/2 kT

How much amount of NaOH is required to prepare 100 mL of 1 N solution.

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80 g

4 g

40 g

zero

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.

Which of the following pairs of fundamental particles are present in equal numbers in a neutral atom.

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Proton and neutron

Proton and positron

Electron and proton

Neutron and electron

The height to which a liquid will rise in an open capillary tube is inversely proportional to.

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Temperature of the liquid

Surface tension

Density of the liquid

Air pressure

Rutherford proposed the nuclear model of the atom to account for the result of experiments in which the alpha particles are scattered from metal foils.Which of the following statements in not related to Rutherford observation.

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An atom consists of central core or nucleus around which the protons exist.

The nucleus has most of the mass of the atom

the nucleus consists of protons and neutrons.

Each distinct atom has a specific number of protons.

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

The depolarizer used in dry cell batteries in.

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NH4Cl

MnO2

KOH

Na2PO4

The Langmuir theory of unimolecular adsorption is generally valid at.

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Low pressures and low temperature

Low pressures and high temperature

High pressures and low temperature

High pressure and high temperature

The vapour pressure of a liquid

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Always increase's with temperature

Always decreases with temperature

Is independent of temperature

Increase up to the boiling point

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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