A) Glaubers salt - \[N{{a}_{2}}S{{O}_{4}}\cdot 10\,{{H}_{2}}O\]
B) Borax - \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\cdot 7{{H}_{2}}O\]
C) Camallite - \[KCl\cdot MgC{{l}_{2}}\cdot 6{{H}_{2}}O\]
D) Soda ash - \[N{{a}_{2}}C{{O}_{3}}\]
E) Epsom salt - \[MgS{{O}_{4}}\cdot 7{{H}_{2}}O\]
Correct Answer: B
Solution :
Borax\[-N{{a}_{2}}{{B}_{4}}{{O}_{7}}\cdot 10{{H}_{2}}O\]
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