What is $Oleum$?

  • A
    Castor oil
  • B
    Oil of vitriol
  • C
    Fuming $H_2SO_4$
  • D
    None of these

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Permono sulphuric acid is known as

Identify the method used to obtain $SO_2$ gas in industry.

Match List-$I$ with List-$II$ :
List-$I$ (Oxoacids of Sulphur) List-$II$ (Bonds)
$A$. Peroxodisulphuric acid $I$. Two $S-OH$,Four $S=O$,One $S-O-S$
$B$. Sulphuric acid $II$. Two $S-OH$,One $S=O$
$C$. Pyrosulphuric acid $III$. Two $S-OH$,Four $S=O$,One $S-O-O-S$
$D$. Sulphurous acid $IV$. Two $S-OH$,Two $S=O$

Choose the correct answer from the options given below.

Explain the occurrence of group-$16$ elements.

Caro's acid is

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