Periodic Classification and Periodic Properties 2 Question 13
13. The set representing the correct order of first ionisation potential is
(2001, 1M)
(a) $\mathrm{K}>\mathrm{Na}>\mathrm{Li}$
(b) $\mathrm{Be}>\mathrm{Mg}>\mathrm{Ca}$
(c) $\mathrm{B}>\mathrm{C}>\mathrm{N}$
(d) $\mathrm{Ge}>\mathrm{Si}>\mathrm{C}$
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Answer:
Correct Answer: 13. (d)
Solution:
- In a group, ionisation energy decreases down the group
$$ \mathrm{Be}>\mathrm{Mg}>\mathrm{Ca} $$
