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

00:00
Question # 1

Orbitals having same energy are called

Question # 2

Number of neutrons in heavy hydrogen atom is

Question # 3

The quantum number which describes the shape of the orbital is

Question # 4

When the 6d orbital is completed the entering electron goes into

Question # 5

The valence orbital configuration of an element with atomic number 23 is

Question # 6

The velocity of photon is:

Question # 7

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

Question # 8

Quantum number value for 2p orbitals are:

Question # 9

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 # 10

The size of electronic shell is described by

Question # 11

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 12

Which of the following is not charged particle

Question # 13

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

Question # 14

Orbital having same energy is called:

Question # 15

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

Question # 16

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

Question # 17

The configuration 1s22s22p53s1shows

Question # 18

The nature of the positive rays depend on

Question # 19

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 20

Quantum number values for 2p orbitals are

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

Bohr model of atom is contradicted by:

Question # 26

Effective magnetic moment of Sc3+ion is

Question # 27

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

Question # 28

Pauli's principle is applicable to

Question # 29

Which of the following orbitals have a dumb bell shape?

Question # 30

Heaviest particle is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
2 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
3 Cathode rays emitted from cathode are
A. Canal rays
B. Protons
C. Electrons
D. Positrons
4 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
5 In which of the following pairs, the numbers of electrons in the outermost shell are different?
A. As,Sb
B. Ge,Sn
C. In,pt
D. Se,Te
6 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
7 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
8 What is the packet of energy called?
A. Electron
B. Photon
C. Positron
D. Proton
9 Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called
A. Stark effect
B. Zeeman effect
C. Compton effect
D. Photoelectric effect
10 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.

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