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 symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 2

n + l value for 4f will

Question # 3

Quantum number values for 2p orbitals are

Question # 4

The quantum number which describe the orientation of the orbitals is

Question # 5

When 6s orbital is complete then next electron goes to

Question # 6

Neutron was discovered by:

Question # 7

In the ground state of an atom, the electron is present

Question # 8

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 9

Bohr model of atom is contradicted by:

Question # 10

The charge of an electron is determined by

Question # 11

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 # 12

The four quantum numbers of the valency electron of potassium are

Question # 13

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

Question # 14

When potassium metal is exposed to violet light

Question # 15

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

Question # 16

The e.m value for positive rays maximum for:

Question # 17

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 18

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 19

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

Question # 20

The degenerate orbitals p-sub shell are

Question # 21

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 22

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

Question # 23

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 24

Which is not true with respect to cathode rays?

Question # 25

The radius of first orbit of H-atom is

Question # 26

Their e/m, ratio resembles with that of electrons

Question # 27

The number of neutrons in the element 94Be is

Question # 28

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 29

The order of distance between the various Bohr orbits is

Question # 30

The nature of the positive rays depend on

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The charge of an electron is determined by
A. J.J. Thomson
B. Crooks
C. Perrin
D. R.A.Millikan
2 Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is
A. dxy
B. dxz
C. dz2
D. dx2- y2
3 When 6s orbital is complete then next electron goes to
A. 6p
B. 6d
C. 5d
D. 4f
4 Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called
A. Stark effect
B. Zeeman effect
C. Compton effect
D. Photoelectric effect
5 With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:
A. Greater.
B. same.
C. Smaller.
D. Not fixed.
6 The nature of positive rays depend on:
A. Nature of discharge tube.
B. Nature of resident gas.
C. Nature of electrode.
D. All of above.
7 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
8 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.
9 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
10 Which is not true with respect to cathode rays?
A. A stream of electrons
B. Charged particles
C. Move with speed as that of light
D. Can be deflected by magnetic fields

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