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

Which have better penetrating power

Question # 2

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

Question # 3

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 4

The nature of positive ray depend on:

Question # 5

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

Question # 6

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Question # 7

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 8

Which of the following is not a sub-atomic particle

Question # 9

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

Question # 10

Neutron was discovered by:

Question # 11

Rutherford's planetary like picture of the atomic modal was defective because

Question # 12

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

Question # 13

Proton was discovered by:

Question # 14

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 15

Photons of yellow colour are ______ energetic than violet colour

Question # 16

Which of the following is not charged particle

Question # 17

Which of the following was discovered first:

Question # 18

The radius of first orbit of hydrogen atom

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

The value of Plank's constant 'h' is

Question # 23

The mass of the neutron is of the order of

Question # 24

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 # 25

Balmer's series is in ______ region

Question # 26

Orbitals having same energy are called

Question # 27

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

Question # 28

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

Question # 29

The radiations with wavelength shorter than violet light are called

Question # 30

The velocity of photon is:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
2 Effective magnetic moment of Sc3+ion is
A. 1.73
B. 0
C. 5.92
D. 2.83
3 The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to
A. 5s
B. 5p
C. 5d
D. 5f
4 The quantum number which determines the shape of the orbital is
A. principal
B. azimuthal
C. magnetic
D. spin
5 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.
6 The ratio of the ionization energy of H and Be3+is
A. 1 : 1
B. 1 : 3
C. 1 : 9
D. 1 : 16
7 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
8 Schrodinger wave equation describes electron completely because
A. It describes a set of four quantum number
B. It describes the particle nature of electron
C. It measures wavelength of electron
D. It describes electron moving in specific orbit
9 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
10 The four quantum numbers of the valency electron of potassium are
A. 4,1,1,1/2
B. 4,0,0,1/2
C. 4,1,0,1/2
D. 4,4,0,1/2

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