Comment, sulphuric acid is referred to as:
(b) oil of vitriol

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Solution

Sulphuric acid ( $H_{2} S O_{4}$ ) is referred to as oil of vitriol as it was obtained as an oily viscous liquid by heating crystals of green vitriol ( $F e S O_{4} . 7 H_{2} O$ ).

Sulphur trioxide ( $S O_{3}$ ) evolved, gets dissolved in water forming sulphuric acid ( $H_{2} S O_{4}$ ).

$2 F e S O_{4} .7 H_{2} O Δ ⟶ F e_{2} O_{3} + S O_{2} + S O_{3} + 14 H_{2} O$
(Green vitriol)

$S O_{3} + H_{2} O \to H_{2} S O_{4}$ (Oil of vitriol)

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Why is sulphuric acid known as king of chemicals and oil of vitriol?

Give reasons for the following :

(a) Sulphuric acid forms two types of salts with NaOH,

(b) Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide,

(d) Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.

Which of the following acid is also known as oil of vitriol?

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