Chemistry Class-11: Chapter –2. Structure of Atom – Part-2

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Multiple Choice Questions

Questions 5:

Which of the following statements about the electron is incorrect?

(i) It is a negatively charged particle.

(ii) The mass of electron is equal to the mass of neutron.

(iii) It is a basic constituent of all atoms.

(iv) It is a constituent of cathode rays.

Answer: (ii)

Solution:

Questions 6:

Which of the following properties of atom could be explained correctly by Thomson Model of atom?

(i) Overall neutrality of atom.

(ii) Spectra of hydrogen atom.

(iii) Position of electrons, protons and neutrons in atom.

(iv) Stability of atom.

Answer: (i)

Solution:

Questions 7:

Two atoms are said to be isobars if.

(i) they have same atomic number but different mass number.

(ii) they have same number of electrons but different number of neutrons.

(iii) they have same number of neutrons but different number of electrons.

(iv) sum of the number of protons and neutrons is same but the number of protons is different.

Answer: (iv)

Solution:

Questions 8:

The number of radial nodes for 3p orbital is __________.

(i)

(ii)

(iii)

(iv)

Answer: (iv)

Solution:

Questions 9:

Number of angular nodes for orbital is __________.

(i)

(ii)

(iii)

(iv)

Answer: (iii)

Solution:

Questions 10:

Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

(i) Pauli’s exclusion principle.

(ii) Heisenberg’s uncertainty principle.

(iii) Hund’s rule of maximum multiplicity.

(iv) Aufbau principle.

Answer: (ii)

Solution: