Physical properties and molecular structure MCQ B.Sc.TY semester-V

B.Sc.Third year  Chemistry UG degree 

 Physical properties and molecular structure

Optical activity and its measurement, dipole moment and its measurement by temperature change method, magnetic property and its measurement by Guoy balance method, Applications of optical activity, dipole moment and magnetic property for determination of structure of molecule.

MULTIPLE CHOICE QUESTIONS

1.The molecules which have partial positive charge at one end and a partial negative charge at the other are called
(a) ion-pairs
(b)charged molecules
(c) dipoles
(d)electric molecules
Answer. (c)

2.The molecular mass of a compound is an example of
(a) Additive property
(b)Constitutive property
(c) Additive as well as constitutive property
(d) None of these
Answer. (a)

3.The dipole moment of a polar substance is given by the formula, where q is charge at one end and r is the distance between the opposite charges
(a)   Π= q X r
(b)   µ= q X r
(c)     I= mr²
(d)    None of these
Answer. (c)

4.Dichlorobenzene exists in three isomers-ortho, meta and para isomers. Out of these three isomers, one  with highest dipole moment will be
(a)    Ortho isomer
(b)      Para isomer
(c)     Meta isomer
(d)     all have same value
Answer. (a)

5.Chiral molecule has …
(a)     One Plane of symmetry
(b)      Centre of symmetry
(c)     Infinite plane of symmetry
(d)      No plane of symmetry
Answer. (a)

6.The net dipole moment of the molecule is
(a)   sum of all individual bond moments
(b)    product of all individual bond moments
(c)    vector resultant of all the individual bond moments
(d)    none of the above
Answer. (c)

7.Diamagnetic substance is ------------ by magnetic field.
(a) attract
(b) repelled
(c)Rotated
(d) resolved
Answer. (b)

8.The substances which retain their magnetic property after removing from magnetic field is called as
(a)   Daimagnetic
(b)  Paramagnetic
(c)   Ferrimagnetic
(d)  Ferromagnetic
Answer. (d)

9. Paramagnetic property is due to presence of
(a)  Paired electron
(b)  Unpaired electron
(c)    Both paired and unpaired electrons
(d)   None of these
Answer. (b)

10. Iron cobalt and Nickel is the example of
(a)Daimagnetic
(b)Paramagnetic
(c) Ferrimagnetic
(d)Ferromagnetic
Answer. (d)