2
Q:

# A mixture of ethyl alcohol  and water can be seperated  by

 A) evaporation B) sublimation C) using a seperating funnel D) fractional distillation

Explanation:

Fractional distillation is the process of seperation of a mixture of two or more liquids into the different fractions, which differ fairly widely in their boiling points. The liquid with a lower boiling point will be vaporized first and hence would be the distillate (first fraction). Eg. Ethyl alcohol has a boiling point of $\inline 78.1^{o}C$ and water $\inline 100^{o}C$. When a mixture of these two liquids is heated, alcohol vaporizes first and is collected separately as the distillate.

Subject: Chemistry
Q:

Brass gets discoloured in air because of the presence of which of the following gases in air  ?

 A) Hydrogen sulphide B) Oxygen C) Nitrogen D) Carbon dioxide

Explanation:

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2 208
Q:

Which of the following is a non metal that remains liquid at room temperature  ?

 A) Chlorine B) Phosphorous C) Bromine D) Helium

Explanation:

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3 193
Q:

Permanent hardness of water is due to the presence of  ?

 A) Calcium sulphate B) Calcium bicarbonate C) Sodium bicarbonate D) Magnesium bicarbonate

Explanation:

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6 370
Q:

Select the correct statement (s).

 A) When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive. B) When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative. C) Both (A) and (B) D) None of the above

Explanation:

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Exam Prep: AIEEE

2 238
Q:

Triple point of water corresponds to

 A) 1 atm, 0°C B) 1 atm, 0.01°C C) 1 atm, 0 K D) 4.58 Torr, 0.01°C