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 valence orbital configuration of an element with atomic number 23 is

Question # 2

Quantum number value for 2p orbitals are:

Question # 3

The credit of discovering neutron goes to

Question # 4

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

Question # 5

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

Question # 6

Mass of simple electron is:

Question # 7

Bohr model of atom is contradicted by:

Question # 8

Anode is the surface on which probability of finding electron is:

Question # 9

Which have better penetrating power

Question # 10

What is the packet of energy called?

Question # 11

The value of Plank's constant 'h' is

Question # 12

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

Question # 13

The charge of an electron is determined by

Question # 14

Which is not true with respect to cathode rays?

Question # 15

The e.m value for positive rays maximum for:

Question # 16

The charge over mass ratio of electron is:

Question # 17

The total number of orbitals possible for the quantum number n is

Question # 18

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 19

Charge to mass ratio of electron was discovered by:

Question # 20

The electronic configuration of an atom/ion can be defined by the following

Question # 21

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 22

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

Question # 23

Effective magnetic moment of Sc3+ion is

Question # 24

Smallest charge of electricity that has been measured so far is

Question # 25

Which one of the following statements is true about discovery of neutrons?

Question # 26

The quantum number which describe the orientation of the orbitals is

Question # 27

The uncertainty principle was stated only

Question # 28

Charge on electron was discovered by:

Question # 29

The energy of ionization of an atom is the energy difference between orbital

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The e.m value for positive rays maximum for:
A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
2 The electronic configuration of an atom/ion can be defined by the following
A. Aufbau principle
B. Pauli's exclusion principle
C. Hund's Rule
D. All the above
3 Charge on electron was discovered by:
A. Millikan.
B. Crook.
C. Neil Bohr.
D. Rutherford.
4 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
5 In the ground state of an atom the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
6 Anode is the surface on which probability of finding electron is:
A. 50%
B. Less than 10%.
C. More than 95%.
D. Zero.
7 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
8 Charge to mass ratio (e/m) of the electron is determined by
A. R. A. Millikan
B. J. J. Thompson
C. G. J, Stoney
D. None of these
9 Neutron was discovered by:
A. Chadwick.
B. Bohr.
C. Rutherford.
D. Plank.
10 Which of the following is not isoelectronic?
A. Na+
B. Mg2+
C. O2-
D. Cl-

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