Related Questions

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
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
What is the pH of distilled water?
A 0
B 1
C 7
D 14
Hydrogen ion concentration in distilled water is
A 10-7
B 7 × 10-7
C 107
D 7 × 107
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

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