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

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

Question # 2

The uncertainty principle was stated only

Question # 3

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

Question # 4

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 5

The charge of an electron is determined by

Question # 6

The charge over mass ratio of electron is:

Question # 7

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 8

The nature of positive rays depend on:

Question # 9

The degenerate orbitals p-sub shell are

Question # 10

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

Question # 11

n + l value for 4f will

Question # 12

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

Question # 13

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

Question # 14

The quantum number which determines the shape of the orbital is

Question # 15

The nature of positive ray depend on:

Question # 16

Energy of electron in the infinite Bohr orbit of H-atom is

Question # 17

The radiations with wavelength shorter than violet light are called

Question # 18

The radius of first orbit of hydrogen atom

Question # 19

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

Question # 20

Schrodinger wave equation describes electron completely because

Question # 21

Which of the following orbitals have a dumb bell shape?

Question # 22

Neutrons was discovered by

Question # 23

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

Question # 24

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

Question # 25

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?

Question # 26

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

Question # 27

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

Question # 28

The nature of the positive rays depend on

Question # 29

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 30

The value of Plank's constant 'h' is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2
2 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.
3 Which quantum number is sufficient to describe the electron is hydrogen atom?
A. l
B. n
C. m
D. s
4 Which of the following is not charged particle
A. Proton
B. Electron
C. Neutron
D. Hydrogen nucleus
5 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
6 The configuration 1s22s22p53s1shows
A. Excited state of O2
B. Excited state of neon
C. Excited state of fluorine
D. Ground state of fluorine atom
7 The order of distance between the various Bohr orbits is
A. r2- r1> r3- r2> r4- r3> ......
B. r1> r2> r2- r3> r4-r3> .....
C. r2-r1= r3- r2= r4- r3> .....
D. r2- r1> r3- r2< r4- r3< ....
8 An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
A. 3 and 5
B. 3 and 7
C. 3 and 9
D. 2 and 5
9 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
10 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
A. Millikan.
B. J. Perrin.
C. Hittrof
D. J.J. Thomson.

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