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Q.

Marshall’s acid is:


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a

H2SO4

b

H2S2O7

c

H2S2O3

d

H2S2O8 

answer is D.

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Detailed Solution

Concept- The presence of one sulphate group in Caro's acid as opposed to two in Marshall's acid is the main distinction between the two acids. Peroxydisulfuric acid is the chemical name of Caro's acid, whereas peroxydisulfuric acid is the name of Marshall's acid.
There is a peroxide connection in Marshall's acid.
It is also referred to as persulfates.
1-H2S2O8  is known as peroxydisulfuric acid.
2- Peroxydisulfuric acid is also known as Marshall’s acid.
3- Thus, H2S2O8 is Marshall’s acid.
Hence, the correct option is (4).
 
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