Chemistry
Grade-8
Easy
Question
In the process of vacuum distillation the pressure of _______ above the solvent is lowered.
- Filtrate
-
Column
- Precipitate
-
Solute
Hint:
Vacuum distillation is distillation performed under reduced pressure.
The correct answer is:
Column
Vacuum distillation is distillation performed under reduced pressure, which allows the purification of compounds not readily distilled at ambient pressures or simply to save time or energy. This technique separates compounds based on differences in their boiling points. This technique is used when the boiling point of the desired compound is difficult to achieve or will cause the compound to decompose.
In the process of vacuum distillation the pressure of solute above the solvent is lowered.
Related Questions to study
Chemistry
During the separation of an immiscible liquid-liquid mixture by using a separating funnel, the following steps are followed. Arrange these steps in proper order.
(1) The nozzle tap is opened gradually and the denser component is allowed to the dropdown.
(2) The liquid-liquid mixture is poured into the separating funnel clamped vertically.
(3) The light component remains in the flask.
(4) The liquid with higher density settles down at the bottom of the flask
(5) The mixture is allowed to stand where clear layers of liquids are formed.
During the separation of an immiscible liquid-liquid mixture by using a separating funnel, the following steps are followed. Arrange these steps in proper order.
(1) The nozzle tap is opened gradually and the denser component is allowed to the dropdown.
(2) The liquid-liquid mixture is poured into the separating funnel clamped vertically.
(3) The light component remains in the flask.
(4) The liquid with higher density settles down at the bottom of the flask
(5) The mixture is allowed to stand where clear layers of liquids are formed.
ChemistryGrade-8
Chemistry
A mixture of two miscible liquids cannot be separated by:
A mixture of two miscible liquids cannot be separated by:
ChemistryGrade-8
Chemistry
The principle of separation of substances by using a separating funnel is based on:
The principle of separation of substances by using a separating funnel is based on:
ChemistryGrade-8
Chemistry
The process of fractional distillation, is carried out by using a special type of instrument which is known as …….
The process of fractional distillation, is carried out by using a special type of instrument which is known as …….
ChemistryGrade-8
Chemistry
Which among the following component is separated by using the principle of steam distillation ?
Which among the following component is separated by using the principle of steam distillation ?
ChemistryGrade-8
Chemistry
Match the entries of Column A with those of Column B.
| Column A |
Column B |
| (a) Fractional distillation |
(i) purification of aniline |
| (b) Steam distillation |
(ii) Purification of glycerine |
| (c) Vacuum distillation |
(iii) Benzene and ether |
| (d) Separating funnel |
(iv) Methanol and ethanol |
Match the entries of Column A with those of Column B.
| Column A |
Column B |
| (a) Fractional distillation |
(i) purification of aniline |
| (b) Steam distillation |
(ii) Purification of glycerine |
| (c) Vacuum distillation |
(iii) Benzene and ether |
| (d) Separating funnel |
(iv) Methanol and ethanol |
ChemistryGrade-8
Chemistry
Separating funnel is used to separate the mixture of liquids which are:
Separating funnel is used to separate the mixture of liquids which are:
ChemistryGrade-8
Chemistry
Steam distillation is used to separate those components which are:
Steam distillation is used to separate those components which are:
ChemistryGrade-8
Chemistry
The process in which the substance is separated through spinning at a hight speed is called
The process in which the substance is separated through spinning at a hight speed is called
ChemistryGrade-8
Chemistry
In the distillation process, the condenser is used to
In the distillation process, the condenser is used to
ChemistryGrade-8
Chemistry
Identify the incorrect statement/s from the following:
(i) Centrifugation is used in diagnostic laboratories for blood and urine tests.
(ii) Distillation method can be used to separate the butter from the cream.
(iii) Chromatography is useful for separating the alum from impure samples.
Identify the incorrect statement/s from the following:
(i) Centrifugation is used in diagnostic laboratories for blood and urine tests.
(ii) Distillation method can be used to separate the butter from the cream.
(iii) Chromatography is useful for separating the alum from impure samples.
ChemistryGrade-8
Chemistry
Arrange the following steps in ascending order which are involved in the distillation of alcohol.
(i) The flask is heated.
(ii) The vapors of alcohol flow into the condenser, where it gets cooled and converts into liquid again.
(iii) Mixture of alcohol and water are taken in in the distillation flask.
(iv) The remaining liquid is stored in the beaker, and water continues to remain in the flask.
(v) Monitor the temperature with the help of a thermometer.
Arrange the following steps in ascending order which are involved in the distillation of alcohol.
(i) The flask is heated.
(ii) The vapors of alcohol flow into the condenser, where it gets cooled and converts into liquid again.
(iii) Mixture of alcohol and water are taken in in the distillation flask.
(iv) The remaining liquid is stored in the beaker, and water continues to remain in the flask.
(v) Monitor the temperature with the help of a thermometer.
ChemistryGrade-8
Chemistry
Study the given chromatogram, which was obtained for protein extracted from soya milk. Identify the components which are present in the protein?
Study the given chromatogram, which was obtained for protein extracted from soya milk. Identify the components which are present in the protein?
ChemistryGrade-8
Chemistry
Which of the following method is used for checking the purity of pharmaceuticals?
Which of the following method is used for checking the purity of pharmaceuticals?
ChemistryGrade-8
Chemistry
Identify the mixture which can be separated by using distillation.
Identify the mixture which can be separated by using distillation.
ChemistryGrade-8
