Question # 1

A gas with minimum charge to mass ratio, when cathode rays are passed through it

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Hydrogen

Oxygen

Nitrogen

Chlorine

Transition from various energy levels to lowest energy level gives:

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P-fund series

Lyman series

Balmer series

Paschen series

In general, for exothermic reactions to be spontaneous

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Temperature should be high

Temperature should be zero

Temperature should be low

Temperature has no effect

The law of lavoisier and Laplace illustrates

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The principle of conservation of energy.

Equivalence of mechanical and thermal energy

The principle of conservation of matter

Equivalent of mechanical and chemical energy

Free energy change for a reversible process is:

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>0

<0

Equal to zero

Unpredictable

Enthalpy represents:

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reaction rate

heat content

activation energy

energy state

The electrons are put in energy sub-levels in the order of increasing energy values. This is a statement of

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Hundus rule

Afbau principle

Pauli exclusion principle

Phase rule

The velocity of photon is:

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Independent of its wavelength.

Depends on its wavelength.

Equal to square of its amplitude.

Depends on its source.

The wave number of the light emitted by a certain source is 2 x 10⁶m. The wavelength of this light is

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500 nm

500 m

200 nm

5 x 10⁷m

Cathode rays drive a small paddle wheel placed in their path. The observation indicates that

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Cathode rays are material particles having momentum

Cathode rays are negatively charged

Cathode rays produce X-rays

Cathode rays travel in straight line

Point out the orbitals which are degenerate in a multi electron atom

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1s, 2s orbitals

2d orbitals

3s, 3p, 3d orbitals

3d orbitals

Positive rays produce in discharge tube from

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Electricity

Gas molecule

Anode

Cathode

n + l value for 4f will

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2

5

7

9

In chromium (Cr - 24) the number of electrons with azimuthal quantum numbers, l = 1 and 2 are respectively

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12 and 4

12 and 5

4

5

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

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

Arrangement of the fundament particles within an atom determines its

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physical properties

chemical properties

physical and chemical properties

no properties

Quantum numbers are derived from

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Schrodinger wave equation

De-Broglie's equation

Bragg's equation

Planck's equation

The value of R (Rydberg's constant) is _____________ m^-1

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1.0974 x 10⁷

1.0842 x 10⁷

1.082 x 10^-7

Both a and b

According to the Aufbau principle the electrons and added first to the orbital:

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In sub-levels of zero energy

In sub-levels of highest energy

In sub-levels oflowest energy

of no shell

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