How u are multiplying the decimal values (ratios) to 2 or 4 to get S.R.?? Is there any specific calculations regarding this?

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Q. Which of the following options are correct regarding the manufacture of

H_{2} {S O}_{4}

by Contact process?

The statements given below are regarding the contact process for the manufacture of

H_{2} {S O}_{4}

.
(a) Manufacture of

{S O}_{2}

from sulphur is a reversible process.
(b) High pressure, optimum temperature and specific catalyst is required to obtain a better yield of

{S O}_{3}

.
(c)

{S O}_{3}

is hydrolysed to get

H_{2} {S O}_{4}

.
(d) Pyrosulphuric acid is hydrolysed to get

H_{2} {S O}_{4}

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Standard VI Mathematics