Question # 1

Which of the following is not isoelectronic?

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Na⁺

Mg²⁺

O^2-

Cl^-

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

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0, 1, 2, 3

+3, +2, +1, -1, -2, -3

0, -1, -2 ,-3

-3, 0, +3

Smallest charge of electricity that has been measured so far is

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Charge on a-rays

Charge on electron (1.602 x 10^-19C)

Charge on x-rays

Charge on gamma rays

Rutherford's experiment led to the discovery of

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Nucleus

Electron

Proton

alpha particle

Orbitals having same energy are called

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Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Which of the following was discovered first:

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Charge to mass ratio of electrons.

Mass of electrons.

Charge of electrons.

All of above at same time.

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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dxy

dxz

dz²

dx²- y²

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

The total number of orbitals in a shell with principal quantum number 'n' is

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2n

2n²

n²

n + 1

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Neutrons are attracted by nucleus

Neutrons carry out nuclear reactions

Neutrons carry no charge

Neutrons are electromagnetic radiations

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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Alpha rays.

Negative particles.

Electromagnetic rays.

Positive particles.

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.

Which one of the following particles has amass 1/1836 time, that of hydrogen?

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Neutron.

Proton.

Electron.

Positron.

Rutherford's atomic model suggests the existence of

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Atom

Nucleus

alpha particle

Measons

The nature of the positive rays depend on

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The nature of the electrode

The nature of the discharge tube

The nature of the residual gas

All of the above

The maximum number of electrons in a subshell for which l = 3 is

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14

10

8

4

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

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