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Question 11 Mark
List some solvents other than water and state their uses
Answer
Some solvents other than water and state their uses are
$\rightarrow$ Ethanol: It is an important industrial chemical.
$\rightarrow$ Methanol: It is used in plastics, paints, car parts.
$\rightarrow$ Acetone: It is used as nail polish remover, paint remover.
$\rightarrow$ Toluene: It is used in making paints, paint thinners.
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Question 21 Mark
How is paper chromatography used to separate various components of coloured solutes present in a mixture like ink, dyes, etc. ?
Answer
To perform ink chromatography, you put a small dot of ink to be separated at one end of a strip of filter paper. This end of the paper strip is placed in a solvent. The solvent moves up the paper strip and, as it travels upward, it dissolves the mixture of chemicals and pulls them up the paper.
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Question 31 Mark
Describe an experiment for separation of common salt from a mixture of common salt and water.
Answer
Water and salt can be separated through the process of distillation or evaporation. The water is boiled till it evaporates into vapor and leaves salt behind as a solid. The boiling point of water is lower compared to the boiling point of salt.
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Question 41 Mark
What do you understand by the following terms : Distillate
Answer
A distillate is a liquid which is condensed from a vapor during distillation.
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Question 51 Mark
What do you understand by the following terms : Distillation
Answer
Distillation is a process of heating a solution in such a way that liquid converts into its vapors and then these vapors are cooled and collected.
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Question 61 Mark
What do you understand by the following terms : Paper chromatography
Answer
Paper chromatography is a technique which is used to separate low-molecular-mass compounds based on their distribution between stationary phase and mobile phase.
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Question 71 Mark
Define :-Separating Funnel:
Answer
A separating funnel is a funnel that is used to separate immiscible liquids.
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Question 81 Mark
Define:-Fractional Distillation:
Answer
The process of taking a chemical mixture and using heat to separate out the various components in that mixture is called fractional distillation.
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Question 91 Mark
Define:-Sublimation:
Answer
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid. Example: Dry ice” or solid carbon dioxide sublimes.
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Question 101 Mark
Define:-Evaporation
Answer
Evaporation is a process by which water is transformed from liquid to a gaseous state. Heat is the main cause of evaporation.
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[1 Mark Question Answer] - CHEMISTRY STD 7 Questions - Vidyadip