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

Which of the following was discovered first:

Question # 2

Mass of simple electron is:

Question # 3

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

Question # 4

Schrodinger wave equation describes electron completely because

Question # 5

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

Question # 6

The charge over mass ratio of electron is:

Question # 7

The total number of orbitals possible for the quantum number n is

Question # 8

In the ground state of an atom the electron is present

Question # 9

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 10

Charge to mass ratio of electron was discovered by:

Question # 11

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

Question # 12

The electron in an atom

Question # 13

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 # 14

The radius of first orbit of hydrogen atom

Question # 15

Energy of electron in first orbit of H atom is

Question # 16

Proton was discovered by:

Question # 17

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

Question # 18

Which of the following is not a property of cathode rays

Question # 19

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

Question # 20

The divisibility of atom was shown by

Question # 21

When 6s orbital is complete then next electron goes to

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

E = hv is the

Question # 26

The nature of the positive rays depend on

Question # 27

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

Question # 28

The credit of discovering neutron goes to

Question # 29

Which of the following is not charged particle

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
2 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
3 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
4 Energy of electron in the infinite Bohr orbit of H-atom is
A. 0 KJ/mole
B. 1 KJ/mole
C. -1 KJ/mole
D. -1313.32 KJ/mole
5 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
6 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
7 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
8 The uncertainty principle was stated only
A. De Brogilie
B. Heinsenberg
C. Einstein
D. Schrodinger
9 The value of charge on electron is
A. 1.602 x 10-19coulombs
B. 1.602 x 10-18coulombs
C. 1.602 x 10-17coulombs
D. 1.602 x 10-16 coulombs
10 The range of visible spectrum is
A. 300 - 600 nm
B. 600 - 900 nm
C. 400 - 750 nm
D. 100 - 300 nm

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