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

Number of neutrons in heavy hydrogen atom is

Question # 2

Pauli's principle is applicable to

Question # 3

Subsidiary quantum number specifies

Question # 4

Which have better penetrating power

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The orbitals having n + l = 5 are

Question # 9

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

Question # 10

The number of electrons in the M shell of the element with atomic number 24 is

Question # 11

Their e/m, ratio resembles with that of electrons

Question # 12

The number of spherical nodes in 3p orbitals are

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

Mass of simple electron is:

Question # 15

Smallest charge of electricity that has been measured so far is

Question # 16

The radius of first orbit of hydrogen atom

Question # 17

1 erg of energy corresponds to

Question # 18

The e.m value for positive rays maximum for:

Question # 19

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

Question # 20

The quantum number which determines the shape of the orbital is

Question # 21

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

Question # 22

The size of electronic shell is described by

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

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 # 27

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 28

Rutherford's atomic model suggests the existence of

Question # 29

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 30

Balmer's series is in ______ region

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
2 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration
A. Nitrogen
B. Carbon
C. Fluorine
D. Oxygen
3 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher
4 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
5 Which of the following orbitals have a dumb bell shape?
A. s
B. p
C. d
D. f
6 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
7 Spectrum of white light is continuous becuase
A. Colors separated by dark spaces
B. There are no boundary lines between the colours
C. The radiations are in infrared region
D. The radiatins fall in ultraviolet region
8 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
9 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
10 Quantum number values for 2p orbitals are
A. n = 2, l = 1
B. n = 1, l = 2
C. n = 1, l = 0
D. n = 2, l = 0

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