Question

In which case first has lower melting point than second?

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

Answer 1

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

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

(A) The melting point of magnesium is 924 K which is lower than the melting point of beryllium which is 1560 K.
(B) The melting point of beryllium is 1560 K which is higher than the melting point of calcium.
(C) The melting point of cesium is 302 K which is lower than the melting point of lithium which is 454 K.
(D) The melting point of potassium is 336 K which is lower than the melting point of Li which is 454 K.