JEE MAIN - Chemistry (2018 - 15th April Morning Slot - No. 7)
The correct match between items of List-I and List-II is :
| List - I | List - II | ||
|---|---|---|---|
| (A) | Coloured impurity | (P) | Steam distilation |
| (B) | Mixture of o-nitrophenol and p-nitrophenol |
(Q) | Fractional distilation |
| (C) | Crude Naphtha | (R) | Charcoal treatment |
| (d) | Mixture of glycerol and sugars |
(S) | Distillation under reduced pressure |
(A)-(R), (B)-(S), (C)-(P), (D)-(Q)
(A)-(R), (B)-(P), (C)-(S), (D)-(Q)
(A)-(R), (B)-(P), (C)-(Q), (D)-(S)
(A)-(P), (B)-(S), (C)-(R), (D)-(Q)
Explanation
(a) Charcoal treatment removes coloured impurity through adsorption.
(b) Steam distillation separates the mixture of o-nitrophenol and p-nitrophenol. The o-nitrophenol is steam volatile (due to intramolecular hydrogen bonding), and the para isomer is not volatile.
(c) Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
(d) Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.
(b) Steam distillation separates the mixture of o-nitrophenol and p-nitrophenol. The o-nitrophenol is steam volatile (due to intramolecular hydrogen bonding), and the para isomer is not volatile.
(c) Fractional distillation separates crude naphtha. Naphtha is a flammable liquid hydrocarbon mixture.
(d) Distillation under reduced pressure separates mixture of glycerol and sugars. Vacuum distillation lowers the boiling point and prevents decomposition.
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