Which acid is known as 'Oil of Vitriol'? MCQ with Answer and Explanation

Question
Which acid is known as 'Oil of Vitriol'?
A. Sulphuric acid
B. Hydrochloric acid
C. Acetic acid
D. Nitric acid
Answer: Option A
Solution (By JKSSB Mock Tests)
Sulphuric acid (H₂SO₄) is historically called oil of vitriol because it was prepared by distilling green vitriol (ferrous sulfate heptahydrate). It is a dense, oily liquid. Nitric acid is aqua fortis, hydrochloric acid was called muriatic acid or spirit of salt. Sulphuric acid is the king of chemicals due to its widespread use in industries like fertilizer, petroleum refining, and chemical synthesis.
This question belongs to: Science chemistry
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Practice More chemistry Questions

Question #1
The rate of diffusion of a gas is:
A. Directly proportional to the square root of its density.
B. Directly proportional to its density.
C. Inversely proportional to the square root of its density.
D. Independent of its density.
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Correct Answer: Option C

Explanation:
Graham's Law of Diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its density (or molar mass) at constant temperature and pressure (r ∝ 1/√d). Lighter gases diffuse faster than heavier ones, which explains why helium balloons deflate quickly.
This question belongs to: Science chemistry
Question #2
A gas occupies 2.0 L at 1.0 atm. If pressure is increased to 4.0 atm at constant temperature, the volume will be:
A. 1.0 L
B. 2.0 L
C. 0.5 L
D. 8.0 L
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Correct Answer: Option C

Explanation:
Boyle's law: P₁V₁ = P₂V₂. Given P₁=1.0 atm, V₁=2.0 L, P₂=4.0 atm. V₂ = (1.0 × 2.0) / 4.0 = 0.5 L. Volume decreases as pressure increases, because gas is compressible. The product PV is constant for a fixed mass of gas at constant T. Scuba divers experience this; as they dive deeper, pressure increases, reducing air volume in lungs.
This question belongs to: Science chemistry
Question #3
Which of the following metals is used in the thermite welding process?
A. Aluminium
B. Zinc
C. Lead
D. Copper
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Correct Answer: Option A

Explanation:
Thermite: Fe₂O₃ + 2Al → 2Fe + Al₂O₃. Aluminium powder reduces iron oxide, producing molten iron for welding. Al is chosen due to its high reactivity and exothermic reaction.
This question belongs to: Science chemistry
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