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

Balmer's series is in ______ region

Question # 2

Orbitals having same energy are called

Question # 3

Schrodinger wave equation describes electron completely because

Question # 4

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

Question # 5

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

Question # 6

The credit of discovering neutron goes to

Question # 7

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 8

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 9

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

Question # 10

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

Question # 11

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 12

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

Question # 13

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

Question # 14

The configuration 1s22s22p53s1shows

Question # 15

The nature of the positive rays depend on

Question # 16

The nature of positive rays depend on:

Question # 17

Which have better penetrating power

Question # 18

The mass of the neutron is of the order of

Question # 19

The range of visible spectrum is

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

Proton was discovered by:

Question # 24

Rutherford's atomic model suggests the existence of

Question # 25

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

Question # 26

Effective magnetic moment of Sc3+ion is

Question # 27

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

Question # 28

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

Question # 29

The quantum number which determines the shape of the orbital is

Question # 30

Subsidiary quantum number specifies

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Rutherford's atomic model suggests the existence of
A. Atom
B. Nucleus
C. alpha particle
D. Measons
2 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
3 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
4 An electron with n = 3 , l = 2 will be in the sub-shell
A. 3p
B. 3d
C. 3f
D. 3s
5 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
6 Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
A. Millikan.
B. J. Perrin.
C. Hittrof
D. J.J. Thomson.
7 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.
8 Bohr model of atom is contradicted by:
A. Planck's quantum theory
B. Pauli's exclusion theory
C. Heisenberg's uncertainty principle.
D. All of above.
9 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.
10 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite

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