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

The orbital in Rutherford's model is

Question # 2

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

Question # 3

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 4

The value of Plank's constant 'h' is

Question # 5

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

Question # 6

The quantum number which describe the orientation of the orbitals is

Question # 7

The charge of an electron is determined by

Question # 8

Bohr model of atom is contradicted by:

Question # 9

The quantum number which determines the shape of the orbital is

Question # 10

Which of the following was discovered first:

Question # 11

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

Question # 12

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

Question # 13

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 14

Their e/m, ratio resembles with that of electrons

Question # 15

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

Question # 16

The energy of the first electron is helium will be

Question # 17

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

Question # 18

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 19

Charge to mass ratio (e/m) of the electron is determined by

Question # 20

Alpha rays consist of:

Question # 21

Charge to mass ratio of electron was discovered by:

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 26

Anode is the surface on which probability of finding electron is:

Question # 27

Spectrum of white light is continuous becuase

Question # 28

The radius of second Bohr's orbit is

Question # 29

1 erg of energy corresponds to

Question # 30

Azimuthal quantum number of last electron of 11Na is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The value of Plank's constant 'h' is
A. 6.625 x 10-34
B. 6.625 x 10-34J sec
C. 6.625 x 10-34KJ
D. 6.625 x 10-34K Cal
2
Question Image
A. s
B. p
C. d
D. f
3 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
4 Charge on electron was discovered by:
A. Millikan.
B. Crook.
C. Neil Bohr.
D. Rutherford.
5 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
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 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
9 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
10 The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?
A. 6
B. 11
C. 17
D. 23

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