Sodium pyrosulphate, \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} \), can be made by heatin...
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0Sodium pyrosulphate, \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{7} \), can be made by heating
(A) \( \mathrm{NaHSO}_{4} \) strongly
(B) \( \mathrm{NaHSO}_{3} \) strongly
(C) a mixture of \( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \) and \( \mathrm{SO}_{2} \)
(D) a mixture of \( \mathrm{Na}_{2} \mathrm{SO}_{3} \) and excess of sulphur
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