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

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

Question # 2

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

Question # 3

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 # 4

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 5

Which of the following is not a sub-atomic particle

Question # 6

Quantum number values for 2p orbitals are

Question # 7

n + l value for 4f will

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

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

Question # 10

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

Question # 11

Charge to mass ratio of electron was discovered by:

Question # 12

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 # 13

The range of visible spectrum is

Question # 14

Neutron was discovered by:

Question # 15

Which of the following has more unpaired d-electrons?

Question # 16

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 17

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

Question # 18

The nature of positive ray depend on:

Question # 19

The divisibility of atom was shown by

Question # 20

What is the packet of energy called?

Question # 21

The credit of discovering neutron goes to

Question # 22

Charge of an electron is:

Question # 23

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 24

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

Question # 25

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

Question # 26

When electrons revolve in stationary orbits

Question # 27

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

Question # 28

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

Question # 29

The orbital in Rutherford's model is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The wave length of electron as wave is 0.5 nm. What is the wave length in meter
A. 5 x 10-9
B. 5 x 10-12
C. 5 x 10-6
D. 5 x 10-10
2 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
3 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
4 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
5 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
6 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
7 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
8 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
9 Balmer's series is in ______ region
A. Visible
B. U V
C. I. R.
D. None
10 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

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