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 charge over mass ratio of electron is:

Question # 2

Azimuthal quantum number of last electron of 11Na is

Question # 3

Proton was discovered by:

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

In the ground state of an atom the electron is present

Question # 6

The number of spherical nodes in 3p orbitals are

Question # 7

Orbitals having same energy are called

Question # 8

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 9

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

Question # 10

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

Question # 11

Quantum number value for 2p orbitals are:

Question # 12

Smallest charge of electricity that has been measured so far is

Question # 13

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 14

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

Question # 15

Subsidiary quantum number specifies

Question # 16

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

Question # 17

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 18

Rutherford's atomic model suggests the existence of

Question # 19

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

Question # 20

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 21

The principle quantum number describes

Question # 22

The velocity of photon is:

Question # 23

Which of the following is not a sub-atomic particle

Question # 24

Cathode rays emitted from cathode are

Question # 25

Rutherford's model of atom failed because:

Question # 26

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 27

Which of the following was discovered first:

Question # 28

Charge on electron was discovered by:

Question # 29

The total number of possible values of magnetic quantum number for the value of l=3 is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 In the ground state of an atom, the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
2 Charge on electron was discovered by:
A. Millikan.
B. Crook.
C. Neil Bohr.
D. Rutherford.
3 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
4 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
5 The mass of the neutron is of the order of
A. 10-23 kg
B. 10-24kg
C. 10-26kg
D. 10-27kg
6 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
7 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
8 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
9 Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration
A. Nitrogen
B. Carbon
C. Fluorine
D. Oxygen
10 Rutherford's model of atom failed because:
A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.

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