Salt used as a purgative is: (A) \( \mathrm{NaCl} \) (B) ) \( \mathrm{MSO}_{4} \cdot 7 \mathrm{H...

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Salt used as a purgative is:
(A) \( \mathrm{NaCl} \)
(B) ) \( \mathrm{MSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O} \)
(C) \( \mathrm{Ca}_{3} \mathrm{Al}_{2} \mathrm{O}_{6} \)
(D) \( \mathrm{MgCl}_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O} \)
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