Question # 1

The series of lines produced when electron falls from higher energy levels n₂= 2,3,4,5, .......... to n₁= 1 is called

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Balmer series

Paschen series

Pfund series

Lyman series

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

Pressure in gas discharge tube to discover electrons was kept

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10 torr

1 torr

0.1 torr

0.01 torr

The heat change or (enthalpy change) when one mole of a solid substance is converted into the liquid state at its is called heat of fusion

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Melting point

Boiling point

Freezing point

Evaporation point

Mass of simple electron is:

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9.1 x 10³¹kg

9.1 x 10^-30kg

1.66 x 10^-31kg

9.1 x 10^-31kg

total number of d-electrons in an atom of atomic number 26 is:

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7

4

6

5

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

Balmer series lie in:

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Radio-wave region

Visible region

Ultraviolent region

Infrared region

Negative charge particle nature of cathode rays was first demonstrated in 1895 by:

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Millikan

J. Perrin

Hittrof

J. J. Thomson

Maximum potential energy that an electron can have within the atom is:

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Equal to zero

Less than zero

Greater than zero

Infinite

The heat absorbed at constant volume is equal to the system's change in

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enthalpy

Entropy

Entropy x temperature

Internal energy

Which quantum number describe the energy of electron

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s

m

l

n

How many orbitals are allowed for principle quantum number (n) of 3?

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5

6

8

9

A cylinder of gas supplied by PSO is assumed to contain 14 kg of butane.If a normal family requires 20,000 kJ of energy per day for cooking butane gas in the cylinder last for .....days (Δ H_c of C₄H₁₀ = -2658 kJ per mole)

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15 days

20 days

50 days

32 days

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

In Millikan oil-drop experiment, the charges on several different oil drops were as: -5.92, -4.44, -2.96, -8.88. The units are orbitrary. Choose the likely value of the electronic charge in these orbitrary units

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-1.11

-1.48

-2.22

-2.96

In order to decompose 9 g of water 142.5 kJ of heat is required.Hence enthalpy of formation of water is

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-142.5 kJ

+142.5 kJ

-285 kJ

+285 kJ

Total values of magnetic quantum number (m) can be calculated with the expression

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2n²

2l + 1

2(2l+ 1)

3n²

The velocity of photon is:

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Dependent on its source

Equal to square to its amplitude

Dependent on its wavelength

Independent on its wavelength

When enthalpy and entropy change for a chemical reaction are -2.5 x 10³ cals and 7.4 cals deg-1 respectively.Predict that reaction at 298 K is

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Spontaneous

Reversible

Irreversible

Non-spontaneous

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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