Question # 1

A reaction in which heat is given out is:

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a thermochemicla reaction

an exothermic reaction

an endothermic reaction

am energetic reaction

A system absorbs 500 kj heats and performs 250 kj work on the surrounding the increase in internal energy of the system is

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750 kj

500 kj

250 kj

1000 kj

To predict whether a reaction will occur spontaneously or not it is necessary to study of the system

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Free energy

Free heat

Work

Enthalpy

The heat of combustion of C_(graphite) is -393.5 kj mol^-1 The heat of formation of CO₂ from graphite is kj mole^-1

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393.5

-787.0

-393.5

787.0

Angle of deflection of cathode rays was studied by

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Hittorff

Stoney

J. J. Thomson

J. Perrin

Boh's model of atom is contradicted by

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Planck's quantum theory

Quarternization of energy of electrons

Heisenberg's uncertainity principle

Quarternization of angular memeber

The correct relation between internal energy change, enthalpy change and work is:

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ΔH = ΔE - W

ΔH = W + ΔH

ΔH = ΔE + W

ΔE = ΔH - W = 0

The total values of magnetic quantum number of subshell are five, the subshell is

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s-subshell

p-subshell

d-subshell

f-subshell

Anode is the surface on which probability of finding electron is:

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50%

Less then 10%

More then 95%

Zero

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases tot eh highest energy

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Microwave, Infrared, visible, ultraviolet

Radio, visible, infrared, visible, ultraviolet

x-radiation, visible, infrared, microwave

Visible, ultraviolet, infrared, gamma rays

Neutral was discovered by

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Chadwick

Faraday

Newton

Millikan

H₂ + 1/2 O₂ → H₂O:ΔH = -68 kcal

K + H₂O + aq → KOH (aq) + 1/2 H₂; ΔH = -48 kcal

KOH + qa → KOH (aq); ΔH = -14 kcal

from the above data,the standard heat of formation of KOH in kcal mol^-1 is

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-68 +48 -14

-68 -48 +14

68 -48 +14

68 +48 +14

The process for the study of heat of combustion is carried out on bomb calorie mater at:

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constant temperature

constant pressure

constant volume

none of above

The law of thermodynamics that provides the basis for the determination of absolute entropy of substance is

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Zeroth law

First law

Second law

Third law

Paschen, Pfund and Brackett series are found in

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uv region

visible region

ir region

none of these

The radius of first orbit of hydrogen atom

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0.329A°

0.429A°

0.529A°

0.229A°

When 3p orbital is complete, the entering electron goes into

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4s

3d

4p

4f

Which of the following has largest ionization energy

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F

O

Na

Mg

The letter s,p,d,f are used to represent which quantum number

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Azimuthal

Spin

Principle

Magnetic

Chlorine atom has set of n, l, m quantum number for the nupaired electrons

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2, 1, 1

3, 1, 1

2, 1, 0

3, 0, 0

Choose the ionic specie which has more electrons than neutrons

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Na⁺

Mg²⁺

O^2-

Na^-

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