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

Azimuthal quantum number of last electron of 11Na is

Question # 2

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

Question # 3

The degenerate orbitals p-sub shell are

Question # 4

Effective magnetic moment of Sc3+ion is

Question # 5

The e.m value for positive rays maximum for:

Question # 6

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

Question # 7

Charge to mass ratio of electron was discovered by:

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 12

The divisibility of atom was shown by

Question # 13

Neutron was discovered by:

Question # 14

Rutherford's experiment led to the discovery of

Question # 15

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

Question # 16

Which is not true with respect to cathode rays?

Question # 17

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 18

In the ground state of an atom the electron is present

Question # 19

The orbital in Rutherford's model is

Question # 20

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

Question # 21

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

Question # 22

The number of electrons in the M shell of the element with atomic number 24 is

Question # 23

Rutherford's planetary like picture of the atomic modal was defective because

Question # 24

The radius of first orbit of hydrogen atom

Question # 25

Quantum number value for 2p orbitals are:

Question # 26

Spectrum of white light is continuous becuase

Question # 27

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

Question # 28

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 29

Number of neutrons in heavy hydrogen atom is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
2 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
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 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
5 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
6 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
7 Quantum number values for 2p orbitals are
A. n = 2, l = 1
B. n = 1, l = 2
C. n = 1, l = 0
D. n = 2, l = 0
8 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
9 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
10 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.

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