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

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

Question # 2

The principle quantum number describes

Question # 3

Subsidiary quantum number specifies

Question # 4

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

Question # 5

The order of distance between the various Bohr orbits is

Question # 6

The velocity of photon is:

Question # 7

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 8

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 9

Proton was discovered by:

Question # 10

Alpha rays consist of:

Question # 11

Find the magnetic moment of a divalent ion in aqueous solution if its atomic number is 25

Question # 12

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

Question # 13

The radius of second Bohr's orbit is

Question # 14

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 15

Their e/m, ratio resembles with that of electrons

Question # 16

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 # 17

When electrons revolve in stationary orbits

Question # 18

The charge of an electron is determined by

Question # 19

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 20

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 21

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 22

The range of visible spectrum is

Question # 23

The radius of first orbit of hydrogen atom

Question # 24

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

Question # 25

The nature of positive rays depend on:

Question # 26

Rutherford's model of atom failed because:

Question # 27

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

Question # 28

The radius of first orbit of H-atom is

Question # 29

A 4f orbital has

Question # 30

Pauli's principle is applicable to

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Heaviest particle is
A. Meson
B. Neutron
C. Proton
D. Electron
2 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
3 The total number of possible values of magnetic quantum number for the value of l=3 is
A. 3
B. 1
C. 5
D. 7
4 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
5 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
6 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays
7 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
8 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
9 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the
A. low ionization energy of sodium
B. sublimation of metallic sodium to give yellow vapour
C. emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region
D. photosenitivity
10 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

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