NCERT Chemistry Powerdose: Azeotropes

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Question 1

The mixture that forms maximum boiling azeotrope is:

• AEthanol + Water
• BAcetone + Carbon disulphide
• CHeptane + Octane
• DWater + Nitric acid

Question 2

Which of the following is correct about a solution showing positive deviation?

• AVapour pressure observed will be the less than calculated from Raoult’s positive deviation
• BMinimum boiling azeotrope will be formed
• CΔH_mix < 0
• DΔV_mix < 0

Question 3

The following plot is obtained for a binary solution of two volatile liquids A and B. Pick out the correct statement:
P_T = total vapour pressure of liquid A and B.
X_A = mole fraction of A in solution
P_A ° = vapour pressure of pure A
P_B ° = vapour pressure of pure B

• ASolution with composition 'X₀' is a minimum boiling azeotrope.
• BIntermolecular interaction among A and B is lowest at X₀.
• CGiven solution is a non-ideal solution with negative deviation.
• Dnone of these

Question 4

A solution is showing positive deviation from Raoult’s law. Which of the following expressions is incorrect?

• AΔH_mix > 0
• BΔH_mix < 0
• CΔV_mix > 0
• DAll of these

Question 5

The diagram given below is a vapour pressure-composition diagram for a binary solution of A and B. In the solution, A–B interactions are –

• Asimilar to A–A and B–B interactions
• Bgreater than A–A and B–B interactions
• Csmaller than A–A and B–B interactions
• Dunpredictable

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