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

Which of the following was discovered first:

Question # 2

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 3

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

Question # 4

The charge of an electron is determined by

Question # 5

The value of Plank's constant 'h' is

Question # 6

The energy of ionization of an atom is the energy difference between orbital

Question # 7

If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be

Question # 8

The quantum number which describes the shape of the orbital is

Question # 9

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

Question # 10

The nature of positive rays depend on:

Question # 11

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

Question # 12

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

Question # 13

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 14

Which of the following particles has longest wavelength, if they have same speed:

Question # 15

When 6s orbital is complete then next electron goes to

Question # 16

The quantum number which describe the orientation of the orbitals is

Question # 17

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 18

The electron in an atom

Question # 19

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 20

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

Question # 21

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question # 22

What is the packet of energy called?

Question # 23

The radius of second Bohr's orbit is

Question # 24

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 25

Schrodinger wave equation describes electron completely because

Question # 26

Rutherford's atomic model suggests the existence of

Question # 27

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

Question # 28

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 29

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

Question # 30

The principle quantum number describes

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
A. 0, 1, 2, 3
B. +3, +2, +1, -1, -2, -3
C. 0, -1, -2 ,-3
D. -3, 0, +3
2 Which of the following particles has longest wavelength, if they have same speed:
A. Proton.
B. Neutron.
C. Electron.
D. Positron.
3 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom
A. Decreases
B. Increases
C. Remains constant
D. Decreases for low value of Z and increase for higher value of Z
4 For a 3P subshell the set of principle and azimuthal quantum number is
A. n = 1 , l = 2
B. n = 3, l = 0
C. n = 3, l = 1
D. n = 1, l = 3
5 In the ground state of an atom, the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
6 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
7 The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the
A. Orientation of orbital in space
B. Fact that two electrons in the same orbital should have opposite spins
C. Energy of the orbital
D. Spin of the electron
8 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
9 Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25
A. 3.0 BM
B. 4.9 BM
C. 5.9 BM
D. 6.9 BM
10 The quantum number which determines the shape of the orbital is
A. principal
B. azimuthal
C. magnetic
D. spin

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