Classification Of Elements And Periodicity In Properties Ques 24
24. 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
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Answer:
Correct Answer: 24.(b)
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 $Be$.
BETA
