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 number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 2

The four quantum numbers of the valency electron of potassium are

Question # 3

The divisibility of atom was shown by

Question # 4

The nature of positive ray depend on:

Question # 5

In the ground state of an atom the electron is present

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

The credit of discovering neutron goes to

Question # 10

Maximum potential energy that an electron can have within the atom is:

Question # 11

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 12

The e.m value for positive rays maximum for:

Question # 13

Rutherford's atomic model suggests the existence of

Question # 14

Proton was discovered by:

Question # 15

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

Question # 16

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

Question # 17

When 6s orbital is complete then next electron goes to

Question # 18

Which of the following orbitals have a dumb bell shape?

Question # 19

Quantum number values for 2p orbitals are

Question # 20

Rutherford's model of atom failed because:

Question # 21

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

Question # 22

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

Question # 23

Charge on electron was discovered by:

Question # 24

Schrodinger wave equation describes electron completely because

Question # 25

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

Question # 26

Bohr model of atom is contradicted by:

Question # 27

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

Question # 28

Which one of the following statements is true about discovery of neutrons?

Question # 29

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

Question # 30

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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.
2 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
3 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell
4 Photons of yellow colour are ______ energetic than violet colour
A. More
B. Less
C. Equal
D. None
5 In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits
A. Increases
B. Decreases
C. Reaming same
D. Orbits coincide
6 Which one of the following particles has amass 1/1836 time, that of hydrogen?
A. Neutron.
B. Proton.
C. Electron.
D. Positron.
7 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
8 Which have better penetrating power
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
9 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be
A. 1
B. 4
C. 9
D. 12
10 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy

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