Crystals and crystallisation - class-VIII
Description: crystals and crystallisation | |
Number of Questions: 40 | |
Created by: Sara Dalvi | |
Tags: basic analytical techniques elements, compounds and mixtures structure of matter and molecule separation of matter water nature of matter separation of substances is matter around us pure chemistry pure substances and mixtures: separation of mixtures matter around us the nature of matter |
Crystallisation is used to purify :
The salt we get from sea water can have many impurities in it. These impurities can be removed by :
Separation of crystals of alum from impure sample is carried out through :
While obtaining pure copper sulphate from an impure sample what will finally be obtained in the china dish?
Pure $CuSO _4$ can be obtained from an impure sample by :
Why crystallisation is used as a method of obtaining pure $CuSO _4$ from impure sample?
Crystallization is used to separate :
X is a solid. Y is a liquid. How can X be separated from a solution of Y?
The copper sulphate solution is heated gently on a water bath for :
While obtaining pure copper sulphate by crystallization, the solution is saturated is indicated by :
To crystallize copper sulphate, it is dissolved in water and a small quantity of ................. is also added.
During crystallization of copper sulphate, heating is stopped when :
Copper sulphate crystals are of which color after purification?
When are the crystals of copper sulphate obtained?
Soda water can be separated by lowering the pressure.
Which method is used to separate diastereomers?
The method by which common salt is obtained from concentrated seawater is called:
The crystals that are obtained after crystallization are:
Why crystallisation is used for obtaining pure copper sulphate from an impure sample rather than simple evaporation?
Crystals of pure copper sulphate are separated from the solution by :
Which of the following method is used for water treatment?
Crystallization is a process of :
Common salt can be purified by a process of :
The process of crystallization begins by:
After purification by crystallization, copper sulphate crystals can be obtained by :
Why is crystallization better than evaporation to dryness?
What are the characteristics of the solvent used during purification of copper sulphate by crystallization?
The principle behind purification by crystallisation is that the :
During concentration (saturation), copper sulfate solution is constantly stirred to :
Crystallization is better than evaporation to dryness.
Why is dilute sulphuric acid added during crystallization of copper sulphate?
Which of the following can be separated by crystallization?
Technique utilized to separate a mixture of dissolved solids by evaporation according to individual solubilities.
Usually crystals are dried with help of ________.
Why does crystallisation seperate mixtures?
Crystals can be grown by _________.
How would you know if a solution is saturated?
The most suitable method of separation of $1$ mixture of ortho and para-nitrophenols is:
What would you observe when a saturated solution of potassium chloride prepared at $60^0 C$ is allowed to cool to room temperature?
Arrange the following steps in crystallisation of copper sulphate.
A. Dissolve it in minimum amount of water.
B. Take some (approximately 5 g) impure sample of copper sulphate in a china dish.
C. Cover the solution with a filter paper and leave it undisturbed at room temperature to cool slowly for a day.
D. Evaporate water from the copper sulphate solution so as to get a saturated solution.
E. Filter the impurities out.