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 wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 2

The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 3

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 4

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 # 5

Which of the atoms has 1s2, 2s2, 2px22p1y2p1zconfiguration

Question # 6

The principle quantum number describes

Question # 7

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

Question # 8

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 9

Heaviest particle is

Question # 10

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

Question # 11

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 12

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

Question # 13

The e.m value for positive rays maximum for:

Question # 14

Which of the following particles has longest wavelength, if they have same speed:

Question # 15

The order of distance between the various Bohr orbits is

Question # 16

The orbitals having n + l = 5 are

Question # 17

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

Question # 18

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 19

Photons of yellow colour are ______ energetic than violet colour

Question # 20

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

Question # 21

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

Question # 22

Pauli's principle is applicable to

Question # 23

The radiations with wavelength shorter than violet light are called

Question # 24

When potassium metal is exposed to violet light

Question # 25

A 4f orbital has

Question # 26

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

Question # 27

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

Question # 28

The radius of first orbit of H-atom is

Question # 29

Cathode rays emitted from cathode are

Question # 30

Charge to mass ratio of electron was discovered by:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Cathode rays drive a small paddle wheel placed in their path. This observation shows that
A. Cathode rays travel in straight lines
B. Cathode rays are negatively charged
C. Cathode rays produce x-rays
D. Cathode rays are material particles having momentum
2 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
3 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
4 The degenerate orbitals p-sub shell are
A. 2
B. 3
C. 5
D. 7
5 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
6 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< ....
7 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
8 Orbital having same energy is called:
A. Hybrid orbital.
B. Valence orbital.
C. Degenerate orbital.
D. D-orbital.
9 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?
A. 6
B. 11
C. 17
D. 23
10 e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because
A. Cathode rays are small sized particles
B. Cathode rays have same charge
C. Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases
D. Temperature of cathode rays higher

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