e)
II only
Correct Answer:
c) I & III
Explanation:
It is one of the half-cell reactions that take place in the Daniel cell. The above half-cell reaction takes
place in cathode. It undergoes a reduction reaction, where Cu2+ acts as an oxidising agent and Cu
acts as a reducing agent.
Question 14
The scale which is based on an empirical relation between the energy of a bond and the electro
negativities of bonded atoms is
a) Pauling scale
b) Mulliken's scale
c) Sanderson's scale
d) Alfred and Rochow's scale
e) Both a and b
Correct Answer:
a) Pauling scale
Explanation:
Pauling scale is based on an empirical relation between the energy of a bond and the
electronegativities of bonded atoms. Mulliken scale of electronegativity is based on ionisation
energy and electron affinity of an atom.
Question 15
Systematic error is also called
a)
Experimental error
b)
Random error
c)
Indeterminate error
d)
Determinate error
e)
None of these.
Correct Answer:
d) Determinate error
Explanation:
Determinate error is also called systematic error. Determinate errors are those, which are known
and controllable errors. Ex: Instrumental errors and personal errors. Indeterminate errors are those,
which are unknown errors. Ex: room temperature. It is also called random errors.