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

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 2

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

Question # 3

What is the packet of energy called?

Question # 4

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 # 5

Which of the following was discovered first:

Question # 6

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

Question # 7

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 8

n + l value for 4f will

Question # 9

The order of distance between the various Bohr orbits is

Question # 10

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The quantum number which describes the shape of the orbital is

Question # 15

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

Question # 16

The charge of an electron is determined by

Question # 17

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

Question # 18

The number of spherical nodes in 3p orbitals are

Question # 19

Energy of electron in first orbit of H atom is

Question # 20

The principle quantum number describes

Question # 21

The e.m value for positive rays maximum for:

Question # 22

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 # 23

Schrodinger wave equation describes electron completely because

Question # 24

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

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 29

For which of the following sets of quantum numbers and electron will have the highest energy?

Question # 30

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

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Sr.# Question Answer
1 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
2 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
3

Mass of simple electron is:
A.

9.1 x 10-31 kg

B.

9.1 x 10-30 kg

C.

1.66 x 10-31 kg

D.

9.1 x 10-31 kg
4
Question Image
A. Neutrons are attracted by nucleus
B. Neutrons carry out nuclear reactions
C. Neutrons carry no charge
D. Neutrons are electromagnetic radiations
5 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
6 The velocity of photon is:
A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.
7 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.
8 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
9 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
10 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles

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