Question # 1

The unite which indicates the largest amount of energy is;

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joule

electron-volt

calorie

erg

Heat of reaction when one mole of nitrogen combines with one mole of oxygen to yield nitrogen oxide is

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+285.58 kj / mol

-41.6 kj / mole

+180.51 kj / mole

-393.7 kj / mole

Their e/m, ratio resembles with that of electrons

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Alpha rays

Beta rays

Gamma rays

X-rays

Which law among the following has same net change whether it takes place directly or indirectly?

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Graham's law

Boyle's law

Henry's law

Hess's law

The ratio of e/m values of a proton and anα- partical is

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2 : 1

1 : 1

1 : 2

1 : 4

The heat of the neutralization of any strong acid and strong base is always constant and ΔH = -57.3kj This is because

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Both the acid and base undergo complete ionization

During neutralization salt and water are formed

I mole of water is formed for H⁺ and OH^- ions

The reaction is exothermic

Which of the following series lines in the atomic emmision spectrum of hydrogen is in the visible region:

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Paschen

Bracket series

Balmer series

Lyman series

A macroscopic property of a system that describes the initial and final state of the system is called:

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state function

energy of the system

physical property

chemical property

Maximum number of electrons in a subshell is given by

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2l + 1

2l - 1

2(2l + 1)

2(2l - 1)

Water exists in a solid liquid & gaseous state the least rendom state is in the form

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ice

steam

liquid water

equilibrium stage at ice melting

All the naturally occurring processes proceed spontaneously in a direction which lead to

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Decrease of entropy

Increases of enthalpy

Increase of free energy

Decrease of free energy

Electron behaves like

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waves

particle

wave and particle

none of these

The value of charge on electron is

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1.602 x 10^-19coulombs

1.602 x 10^-18coulombs

1.602 x 10^-17coulombs

1.602 x 10^-16coulombs

In an exothermic reaction the internal energy of the products is internal energy of reactions

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Greater than

Lesser than

Equal than

None of these

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle. Pauli's exclusion principle Hunds rule. The Pauli exclusion principles refers to the

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orientation of orbital in space

fact that two electrons in the same orbital should have opposite spins

energy of the orbital

spin of the electron

^{When a bonds breaks:}

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heat is absorbed

temperature increases

heat is evolved

no change in heat contents takes place

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

Which of the followings ins not a sub-atomic particle

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electron

proton

neutron

deuteron

Greater the wave number of photons:

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Greater is the energy associated with them

Smaller is the energy associated with them

Its energy will be variable

Its energy will remain constant

Why does the exothermic reaction

C(diamond)------->C(graphite) ΔH=-3kJ mol^-1

^{not occur spontaneously?}

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A tetrahedral configuration is always more stable than a planar one

Diamond has only strong covalent bonds whereas graphite has both covalent bonds and van der Waal's forces.

The change from diamond to graphite has a high activation energy.

The density of grphite is less than that of diamond

When cathode rays strike the anode metal. X-rays are emitted and not the positive rays because

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cathode rays are material particles

cathode rays knock out electrons from anode which emit X-rays when outer electrons take their place

cathode rays are absorbed by the nucleus

cathode rays become heated

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