The number and type of bonds between two carbon atoms in CaC₂ are:

A mixture of ideal gas is cooled upto liquid helium temperature (4.22K) to form an ideal solution

The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order
K₂CO₃ (A), MgCO₃ (B), CaCO₃ (C), BeCO₃ (D)

Explain the difference in the nature of bonding in LiF and LiI.