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Q.

Identify the correct formula of ‘oleum’ from the following.

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a

$H_{2} S_{2} O_{8}$

b

$H_{2} S_{2} O_{7}$

c

$H_{2} {SO}_{3}$

d

$H_{2} {SO}_{4}$

answer is B.

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Detailed Solution

Oleum is $^{'} H_{2} S_{2} O_{7}^{'} (H_{2} {SO}_{4} + {SO}_{3}) . It is Fuming sulphuric acid .$

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Identify the correct formula of ‘oleum’ from the following.