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

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

Question # 2

Spectrum of white light is continuous becuase

Question # 3

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 4

The nature of positive ray depend on:

Question # 5

The size of electronic shell is described by

Question # 6

The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 7

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

Question # 8

The nature of positive rays depend on:

Question # 9

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

Question # 10

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 11

Which have better penetrating power

Question # 12

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

Question # 13

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 14

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

Question # 15

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

Question # 16

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 17

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 18

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

Question # 19

Orbital having same energy is called:

Question # 20

The radius of first orbit of hydrogen atom

Question # 21

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

Question # 22

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 23

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 # 24

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 25

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 26

Charge of an electron is:

Question # 27

The value of Plank's constant 'h' is

Question # 28

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

Question # 29

Their e/m, ratio resembles with that of electrons

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The valence orbital configuration of an element with atomic number 23 is
A. 3d5
B. 3d3, 4s2
C. 3d3, 4s1, 4p1
D. 3d2,4s2,4p1
2 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
3 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
4 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
5 The energy of ionization of an atom is the energy difference between orbital
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 Pauli's principle is applicable to
A. Degenerate orbits
B. Two electrons in the same orbital
C. One electron
D. None
8 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
9 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
10 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region

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