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Classes
- Grade 9
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- Grade 12
Aptitude Tests

Browse Worksheets
Classes
- Grade 9
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- Grade 11
- Grade 12
Aptitude Tests

ECAT MCAT : Chemistry chapter 2 ATOMIC STRUCTURE

Leave a Comment / By Afshan JAMAL / August 15, 2026

Welcome to your ECAT MCAT : Chemistry chapter 2 ATOMIC STRUCTURE

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

Choose the correct option.

Neutron.

Proton.

Electron.

Positron.

None

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

Choose the correct option.

dxy

dxz

dz²

dx²- y²

None

Charge of an electron is:

Choose the correct option.

1.6 x 10⁻¹⁹ C

9.1 x 10⁻³⁴ C

1.7588 x 10¹¹ C

6.62 x 10⁻³⁴ C

None

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Choose the correct option.

3 and 5

3 and 7

3 and 9

2 and 5

None

When 6s orbital is complete then next electron goes to

Choose the correct option.

6p

6d

5d

4f

None

Light emitted from a source has its wave length 500nm, then its wave number will be

Choose the correct option.

2 x 10⁶m⁻¹

2 x 10⁷m⁻¹

5 x 10⁸m⁻¹

5 x 10⁹m⁻¹

None

Schrodinger wave equation describes electron completely because

Choose the correct option.

It describes a set of four quantum number

It describes the particle nature of electron

It measures wavelength of electron

It describes electron moving in specific orbit

None

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Choose the correct option.

Voltage is low

Discharge tube is not coloured

Gas does not conduct current under ordinary pressure

Temperature low

None

Quantum number values for 2p orbitals are

Choose the correct option.

n = 2, l = 1

n = 1, l = 2

n = 1, l = 0

n = 2, l = 0

None

Rutherford's atomic model suggests the existence of

Choose the correct option.

Atom

Nucleus

alpha particle

Measons

None

Orbitals having same energy are called

Choose the correct option.

Hybrid orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

None

Mass of simple electron is:

Choose the correct option.

9.1 x 10⁻³¹ kg

9.1 x 10⁻³⁰ kg

1.66 x 10⁻³¹ kg

9.1 x 10⁻³¹ kg

None

The credit of discovering neutron goes to

Choose the correct option.

Rutherford

Langmuir

Chadwick

Austen

None

Question Image

Choose the correct option.

Plank's equations

de Broglie's equations

Heisenburg's equation

None

A 4f orbital has

Choose the correct option.

one node

two node

three node

four nodes

None

Which of the following is not charged particle

Choose the correct option.

Proton

Electron

Neutron

Hydrogen nucleus

None

Their e/m, ratio resembles with that of electrons

Choose the correct option.

Alpha rays

Beta rays

Gamma rays

X-rays

None

E = hv is the

Choose the correct option.

Spectral equation

Plank's equation

de Broglie's equation

None of these

None

The radiations with wavelength shorter than violet light are called

Choose the correct option.

Ultraviolet

Infrared

Microwave

Radio frequency

None

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Choose the correct option.

As,Sb

Ge,Sn

In,pt

Se,Te

None

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