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 radius of first orbit of hydrogen atom

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

When electrons revolve in stationary orbits

Question # 6

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 7

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

Question # 8

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

Question # 9

The limiting line of Blamer series in hydrogen spectrum lies in

Question # 10

The nature of positive ray depend on:

Question # 11

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

Question # 12

A 4f orbital has

Question # 13

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

Question # 14

Proton was discovered by:

Question # 15

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

Question # 16

Orbitals having same energy are called

Question # 17

The orbital in Rutherford's model is

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

The number of electrons in the M shell of the element with atomic number 24 is

Question # 22

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 23

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

Question # 24

The mass of the neutron is of the order of

Question # 25

The divisibility of atom was shown by

Question # 26

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

Question # 27

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

Question # 28

Which of the following was discovered first:

Question # 29

n + l value for 4f will

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
2 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
3 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
4 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
5 Which of the following is not a property of cathode rays
A. They can produce x-rays when they strike a heavy metal anode
B. They can cause reduction reaction
C. They produce fluorescence in rare earth and minerals
D. They comprise neutral particles
6 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
7 For which of the following sets of quantum numbers and electron will have the highest energy?
A. 3,2,1,1/2
B. 4,2,-1,1/2
C. 4,1,0,-1/2
D. 5,0,0,1/2
8 The orbital in Rutherford's model is
A. Spiral
B. Circular
C. Both
D. None
9 The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
10 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83

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