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 the infinite Bohr orbit of H-atom is

Question # 2

The order of distance between the various Bohr orbits is

Question # 3

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

Question # 4

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 # 5

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 6

The radius of second Bohr's orbit is

Question # 7

When 3p orbital is complete, the entering electron goes into

Question # 8

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

Question # 9

Mass of simple electron is:

Question # 10

The nature of the positive rays depend on

Question # 11

The four quantum numbers of the valency electron of potassium are

Question # 12

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

Question # 13

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 14

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

Question # 15

Proton was discovered by:

Question # 16

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 17

The nature of positive ray depend on:

Question # 18

The velocity of photon is:

Question # 19

Rutherford's atomic model suggests the existence of

Question # 20

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

Question # 21

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

Question # 22

Charge of an electron is:

Question # 23

Spectrum of white light is continuous becuase

Question # 24

Which of the following is not a property of cathode rays

Question # 25

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 26

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

Question # 27

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 28

The number of spherical nodes in 3p orbitals are

Question # 29

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

Question # 30

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:
A. Alpha rays.
B. Negative particles.
C. Electromagnetic rays.
D. Positive particles.
3 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
4 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit
5 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
6 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
7 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
8 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
9 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
10 Which of the following was discovered first:
A. Charge to mass ratio of electrons.
B. Mass of electrons.
C. Charge of electrons.
D. All of above at same time.

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