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

Rutherford's experiment led to the discovery of

Question # 2

In the ground state of an atom, the electron is present:

Question # 3

Alpha rays consist of:

Question # 4

Heaviest particle is

Question # 5

The spectrum of helium is expected to be similar to that of

Question # 6

What is the packet of energy called?

Question # 7

Quantum number value for 2p orbitals are:

Question # 8

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

Question # 9

When electrons revolve in stationary orbits

Question # 10

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 # 11

When 6d orbital is complete, the entering electron goes into:

Question # 12

The uncertainty principle was stated only

Question # 13

E = hv is the

Question # 14

The radiations with wavelength shorter than violet light are called

Question # 15

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 16

The orbitals having n + l = 5 are

Question # 17

The e.m value for positive rays maximum for:

Question # 18

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

Question # 19

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 20

Which of the following was discovered first:

Question # 21

Number of neutrons in heavy hydrogen atom is

Question # 22

Neutron was discovered by:

Question # 23

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

Question # 24

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 25

Charge on electron was discovered by:

Question # 26

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

Question # 27

The mass of the neutron is of the order of

Question # 28

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

Question # 29

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 30

The number of spherical nodes in 3p orbitals are

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
2 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
3 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
4 The uncertainty principle was stated only
A. De Brogilie
B. Heinsenberg
C. Einstein
D. Schrodinger
5 For a 3P subshell the set of principle and azimuthal quantum number is
A. n = 1 , l = 2
B. n = 3, l = 0
C. n = 3, l = 1
D. n = 1, l = 3
6 The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the
A. Fourth Bohr orbit to the first Bohr orbit
B. Fifth Bohr orbit to the second Bohr orbit
C. Sixth Bohr orbit to the third Bohr orbit
D. Seventh Bohr orbit to the third Bohr orbit
7 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
A. Orientation of orbital in space
B. Fact that two electrons in the same orbital should have opposite spins
C. Energy of the orbital
D. Spin of the electron
8 Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as
A. Hund's rule
B. Heisenberg's principle
C. Paulit exclusion principle
D. Auf bau principle
9 The spectrum of helium is expected to be similar to that of
A. H
B. Li+
C. Na
D. He+
10 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy

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