Related Questions

Hydrogen ion concentration in distilled water is
A 10-7
B 7 × 10-7
C 107
D 7 × 107
With increase in the temperature of pure (distilled) water, its
A POH decreases and pH increases
B POH and pH both 4ecreases
C PH and pOH both increases
D PH decreases and pOH increases
What is the approximate speed of sound in distilled water at 25°C (77°F)?
A 1598 m/s
B 1285 m/s
C 1498 m/s
D 3980 m/s
A 25 ml sample was diluted to 250ml with odourless distilled water so that the odour of the sample no longer perceivable. What was the Threshold odour number?
A 11
B 10
C 25
D 05
What is the name of the computer program that contains the distilled knowledge of an expert?
A Database management system
B Management information System
C Expert system
D Artificial intelligence
An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are being explored; (i) a reboiler is used and (ii) no reboiler is used but steam is fed directly to the bottom of the column. As compared to option (i), in option (ii)
A Less number of trays are required
B Composition of the residue remains unchanged
C More number of trays are required but the residue composition remains unchanged
D More number of trays are required and the residue composition is more dilute in methanol
Kerosene is distilled at
A 65° to 220°C
B 220° to 345°C
C 345° to 470°C
D 470° to 550°C
Petrol is distilled at
A 65° to 220°C
B 220° to 345°C
C 345° to 470°C
D 470° to 550°C
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.
A Continuous
B Steam
C Azerotropic
D None of these
Higher boiling fractions like atmospheric residue is distilled under vacuum at low temperature because at high temperature, there is a tendency of the predominance of
A Thermal cracking
B Gum formation
C Coking
D Discoloration

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