MCQ
Correct formula of calomel is
- ✓$H{g_2}C{l_2}$
- B$HgC{l_2}$
- C$HgC{l_2}.{H_2}O$
- D$HgS{O_4}$
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[Given $pK _{ a }$ of $CH _{3} COOH =4.57$ ]
