Question # 1

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

The principle quantum number describes

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the distance form the nucleus

the shape of the orbital

the orientation of the orbital

the spin of the electron

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

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Hund's rule

Pauli exclusion principle

Aufbau principle

Mosley's law

The nit heat change in a chemical reaction is same whether it is brought about in tow or ,ore different ways in one or several steps .it is known as:

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Henry,s law

Hess,s law

joule,s principal

law of conservation of energy

The maximum number of electrons in a sub-shell is given by the expression

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4l + 2

4l - 2

2l + 1

2n²

The radiations with wavelength shorter than violet light are called

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ultraviolet

infrared

microwave

radio frequency

Greater than wavelength Associated with the photon:

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Greater is its energy

Smaller is its energy

Its energy will be variable

Its energy will remain constant

Quantum number values for 2p orbitals are

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n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

n = 2, l = 1

The number of d-electrons in Fe (z = 26) is not equal to

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p-electrons in Ne (Z = 10)

s-electrons in Mg (Z = 12)

s-electrons in Ca (Z = 20)

p-electrons in Cl (Z = 17)

The correct set of quantum number for the unpaired electron of Cl - atom is

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2, 0, 2, +1/2

2, 1, -1, +1/2

3, 1, -1, +1/2

None of these

In a cation the number of protons is more than the number of

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electron

photons

positrons

neutrons

Pauli exclusion principle states that no two electrons in a given orbital have

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Same for quantum number

Same principal quantum number

Same Azimuthal quantum number

(b) and (c) are correct.

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

The energy required to break 1 mole of bonds of from neutral atom is:

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bond energy

bond strength

bonds length

nine of all

When atom is in the ground state, the electron is present

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Nearest to the nucleus

Nearest to the valence shell

In the second shell

In the nucleus

The ΔH values for reaction C + 1/2 O₂ → CO and CO + 1/2 O₂ → CO₂ are 100 and 200 kJ respectively.The heat of reaction for C + O₂ → CO₂ will be

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50 kJ

100 kJ

150 kJ

300 kJ

Value of R (rydberg's constant)

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1.09678 x 10⁷m

1.09678 x 10⁷cm^-1

1.09678 x 10⁷cm

1.09678 x 10⁷cm^-1

All of the following are state functions except

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P

V

q

H

Which element has high the highest first ionization energy value?

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Li

Be

B

C

Thermodynamics is concerned with

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Total energy of a system

Rate of a chemical change

Energy changes in a system

Mass changes in nuclear reactions

Energy of a photon is related to:

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Wave number

Wave length

Frequency

All of above

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