Chemistry Class-11: Chapter –2. Structure of Atom – Part-3

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Multiple Choice Questions

Questions 11:

Total number of orbitals associated with third shell will be __________.

(i)

(ii)

(iii)

(iv)

Answer: (iii)

Solution:

Questions 12:

Orbital angular momentum depends on __________.

(i)

(ii)

(iii)

(iv)

Answer: (i)

Solution:

Questions 13:

Chlorine exists in two isotopic forms, and but its atomic mass is . This indicates the ratio of and is approximately

(i)

(ii)

(iii)

(iv)

Answer: (iii)

Solution:

Questions 14:

The pair of ions having same electronic configuration is __________.

(i)

(ii) , Mn2+

(iii)

(iv)

Answer: (ii)

Solution:

Questions 15:

For the electrons of oxygen atom, which of the following statements is correct?

(i) for an electron in a orbital is the same as for an electron in a orbital.

(ii) An electron in the 2s orbital has the same energy as an electron in the orbital.

(iii) for an electron in orbital is the same as for an electron in a 2s orbital.

(iv) The two electrons present in the orbital have spin quantum numbers but of opposite sign.

Answer: (iv)

Solution:

Questions 16:

If travelling at same speeds, which of the following matter waves have the shortest wavelength?

(i) Electron

(ii) Alpha particle (He2+)

(iii) Neutron

(iv) Proton

Answer: (ii)

Solution: