Classification of Elements and Periodicity in Properties - Result Question 30
####30. Which of the following order is wrong? [2002]
(a) $NH_3<PH_3<AsH_3-$ Acidic
(b) $Li<Be<$ B $<$ C - First IP
(c) $Al_2 O_3<MgO<Na_2 O<K_2 O-$ Basic
(d) $Li^{+}<Na^{+}<K^{+}<Cs^{+}-$Ionic radius
Show Answer
Solution:
- (b) Along the period, I.P. generally increases but not regularly. Be and $B$ are exceptions. First I.P. increases in moving from left to right in a period, but I.P. of $B$ is lower than $Be$.
