ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

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Question # 1

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 2

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 3

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 4

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 5

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 6

In the ground state of an atom, the electron is present

Question # 7

Heaviest particle is

Question # 8

The orbital in Rutherford's model is

Question # 9

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

Question # 10

Charge to mass ratio of electron was discovered by:

Question # 11

What is the packet of energy called?

Question # 12

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 13

The credit of discovering neutron goes to

Question # 14

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 15

Which of the following is not isoelectronic?

Question # 16

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 17

Subsidiary quantum number specifies

Question # 18

Rutherford's experiment led to the discovery of

Question # 19

Photons of yellow colour are ______ energetic than violet colour

Question # 20

The ratio of the ionization energy of H and Be3+is

Question # 21

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

Question # 22

In the ground state of an atom the electron is present

Question # 23

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

Question # 24

When the 6d orbital is completed the entering electron goes into

Question # 25

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

Question # 26

Pauli's principle is applicable to

Question # 27

Quantum number values for 2p orbitals are

Question # 28

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 29

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 30

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4
2 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm
3 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
4 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
5 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
6 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
7 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
A. 3 and 5
B. 3 and 7
C. 3 and 9
D. 2 and 5
8 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
9 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
10 The ratio of the ionization energy of H and Be3+is
A. 1 : 1
B. 1 : 3
C. 1 : 9
D. 1 : 16

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