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 quantum number which determines the shape of the orbital is

Question # 2

The radiations with wavelength shorter than violet light are called

Question # 3

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

Question # 4

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

Question # 5

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Question # 6

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

Question # 7

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

Question # 8

The order of distance between the various Bohr orbits is

Question # 9

Which of the following is not isoelectronic?

Question # 10

Effective magnetic moment of Sc3+ion is

Question # 11

The quantum number which describe the orientation of the orbitals is

Question # 12

Smallest charge of electricity that has been measured so far is

Question # 13

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 14

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 15

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 16

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

Question # 17

The e.m value for positive rays maximum for:

Question # 18

The electronic configuration of an atom/ion can be defined by the following

Question # 19

Their e/m, ratio resembles with that of electrons

Question # 20

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 21

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

Question # 22

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

Question # 23

The experimental evidences for the existence of atomic nucleus comes from:

Question # 24

Number of neutrons in heavy hydrogen atom is

Question # 25

Charge of an electron is:

Question # 26

The spectrum of helium is expected to be similar to that of

Question # 27

Which have better penetrating power

Question # 28

The energy of the first electron is helium will be

Question # 29

The orbital in Rutherford's model is

Question # 30

The total values of magnetic quantum number of subshell are five, the subshell is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
2 The degenerate orbitals p-sub shell are
A. 2
B. 3
C. 5
D. 7
3 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
4 The radius of second Bohr's orbit is
A. 0.053 nm
B. 0.053/4 nm
C. 0.053 x 4 nm
D. 0.053 x 20 nm
5 Heaviest particle is
A. Meson
B. Neutron
C. Proton
D. Electron
6 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
7 Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
8 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
9 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite
10 When 6s orbital is complete then next electron goes to
A. 6p
B. 6d
C. 5d
D. 4f

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