Question

a substance which cause hardness in water [nh4cl/cacl2/nacl].

Answer 1

$Hey$ $Friend$
★★★

Ans :- CaCl2 is the answer . It causes hardness in water .
★★★

Answer 2

$CaCl_2$ can cause hardness in water.

• The hardness in water caused by calcium chloride is called permanent hardness. It can't be removed by boiling. Some special compounds like zeolites, borax etc forms a complex with the Ca ion and remove the hardness of the water.
• NaCl dissolves in water and forms saltwater.
• Ammonium chloride can not create hardness in water.