# The Compound which is used in preservation of wood is :

$(a)\;NaCl \\(b)\;HgCl_2 \\(c)\; ZnCl_2 \\(d)\;CaCl_2$

The Compound which is used in preservation of wood is : $ZnCl_2$
Zinc chloride is a hygroscopic chemical compound which has multiple uses in the industry and also in our daily life. ... This compound, which is deliquescent has several applications and the main uses include chemical synthesis and textile processing. Along with sodium dichromate, it is helpful in preserving wood.
Hence c is the correct answer.
edited Feb 20