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Which of the following is called Epsom salt?A. `BaSO_(4)`B. `CaSO_(4).2H_(2)O`C. `MgSO_(4).7H_(2)O`D. `Na_(2)SO_(4)` |
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Answer» Correct Answer - 3 Epsom salt, `MgSO_(4),7H_(2)O` ,is a white crystalline soluble salt ,used in medicine and in leather processing In the combined state sulpher occurs as sulphide ores and as sulphates.Coal and crude petrolemium contain small percentage of sulpher compounds and so ,sometimes ,does natural gas. Sulpher in the native form can be obtained from volcanic sources in many places,but these sources and little used now except in japan and Mexico .From Biblical times up till the `20^(th)` centuary volcane sources provided the major sources of S. In early times S in the form of brimstone (burning rock) was used for fumigation. From the `13^(th)` centuary until middle of the `19^(th)` centuary it was used to make gun the power. In th epresent century the major use has been to make `H_(2)SO_(4)` |
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