Question 6
When the pressure of the system remains constant during each step of a process, such process is
said to be
a)
Isothermal process
b)
Adiabatic process
c)
Isochoric process
d)
Isobaric process
e)
None of these
Correct Answer:
d) Isobaric process
Explanation:
For an isobaric process, pressure remains constant. For an isothermal process, temperature of the
system remains constant. In an adiabatic process, no heat enters or leaves the system. In an
isochoric process, volume remains constant.
Question 7
Which is the first element in the periodic table to have '4d' electrons in its electronic
configuration?
a)
Ca
b)
Sc
c)
Rb
d)
Y
e)
La
Correct Answer
: d) Y
Explanation:
Yttrium (Y) has the first 4d electrons in its electronic configuration among the others. Its atomic
number is 39 and its electronic configuration is [Kr] 4d1 5s2. The atomic number of calcium (Ca) is
20; its electronic configuration is [Ar] 4s2. The atomic number of strontium (Sc) is 38;its electronic
configuration is [Kr] 5s2. The atomic number of Rb is 37;its electronic configuration is [Kr] 5s1. The
atomic number of lanthanum (La) is 57;its electronic configuration is [Xe] 5d1 6s2.
Question 8
Among the following, which group of elements have the maximum ionisation energy?
a)
Alkali elements
b)
Chalcogens
c)
Halogens
d)
Noble gases
e)
Both b and c