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

00:00
Question # 1

The mass of the neutron is of the order of

Question # 2

Charge on electron was discovered by:

Question # 3

Alpha rays consist of:

Question # 4

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

Question # 5

The four quantum numbers of the valency electron of potassium are

Question # 6

Balmer's series is in ______ region

Question # 7

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

Question # 8

Smallest charge of electricity that has been measured so far is

Question # 9

Which of the following was discovered first:

Question # 10

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

Question # 11

Bohr model of atom is contradicted by:

Question # 12

Which of the following is not isoelectronic?

Question # 13

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 14

The radius of first orbit of hydrogen atom

Question # 15

The electronic configuration of an atom/ion can be defined by the following

Question # 16

Rutherford's planetary like picture of the atomic modal was defective because

Question # 17

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

Question # 18

Effective magnetic moment of Sc3+ion is

Question # 19

Rutherford's atomic model suggests the existence of

Question # 20

Which of the following is not a sub-atomic particle

Question # 21

Pauli's principle is applicable to

Question # 22

The radius of second Bohr's orbit is

Question # 23

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

Question # 24

Photons of yellow colour are ______ energetic than violet colour

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Which have better penetrating power

Question # 29

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 30

The value of charge on electron is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
2 The maximum number of electrons in a subshell for which l = 3 is
A. 14
B. 10
C. 8
D. 4
3 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
4 The wave length of electron as wave is 0.5 nm. What is the wave length in meter
A. 5 x 10-9
B. 5 x 10-12
C. 5 x 10-6
D. 5 x 10-10
5 The valence orbital configuration of an element with atomic number 23 is
A. 3d5
B. 3d3, 4s2
C. 3d3, 4s1, 4p1
D. 3d2,4s2,4p1
6 When 6s orbital is complete then next electron goes to
A. 6p
B. 6d
C. 5d
D. 4f
7 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
8 Quantum number value for 2p orbitals are:
A. n=2 ,l=1
B. n=1 ,l=2
C. n= ,l=0
D. n=2 ,l=0
9 In Millikan method the oil droplet falls under the force of gravity but it moves upward due to
A. Electric field
B. Magnetic field
C. Incident light
D. X-rays
10 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f

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