Question

In which case second has lower boiling point than first?

• A. Li, K
• B. Be, Mg
• C. Li, Cs
• D. Ca, Mg

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Li, K
B Li, Cs
C Be, Mg
D Ca, Mg

(A) The boiling point of K is $1032$ K which is lower than that of Li ($1615$ K)
(B) The boiling point of Mg is $1363$ K which is lower than that of Be ( $2745$ K).
(C) The boiling point of Cs is $944$ K which is lower than that of Li ($1615$ K).
(D) The boiling point of Mg is $1363$ K is which is lower than that of Ca ($1767$ K).
Hence, all are correct.