Please answer these two questions fast please

Dear Student,
The solution to your first query has been provided below:

Efflorescence is the loss of water (or a solvent) of crystallization from a hydrated or solvated salt to the atmosphere on exposure to air,
​​​​​​e.g., Gypsum, Washing soda, Hydrated Copper Sulphate
$$\begin{gathered} CaS{O}_4.2H_{2}O\stackrel{∆}{\to }CaS{O}_4.\frac{1}{2}{H}_{2}O+\frac{3}{2}{H}_{2}O \\ CuS{O}_4.5H_{2}O\stackrel{∆}{\to }CuS{O}_4+5H_{2}O \end{gathered}$$

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