Filtration and crystallisation - class-VII
Description: filtration and crystallisation | |
Number of Questions: 44 | |
Created by: Akash Patel | |
Tags: the nature of matter nature of matter chemistry separation of substances matter around us pure substances and mixtures: separation of mixtures is matter around us pure separation of matter basic analytical techniques elements, compounds and mixtures structure of matter and molecule |
Pure solid can be obtained from its impure sample by :
Crystallisation is better than simple evaporation because :
In the process of crystallisation, crystals formed by different substances :
When a mixture of common salt and ammonium chloride is heated, white fumes are liberated which change into a white deposit when cooked. What is this substance?
Mixute of ammonium chloride and sodium chloride can be seperated by :
A mixture of barium sulphate and $H _2O$ can be separated by the method of filtration.
A vendor sells white powdered salt-mixed with white powdered stone. The knowledge of which property will help you detect this malpractice?
What is meant by sublimation?
Sublimation is used to separate :
Which of the following shows sublimation on heating?
Which of the following mixtures cannot be separated by sublimation?
The change of solid into vapours on heating and of vapours into solid on cooling is called :
During sublimation of ammonium chloride and salt mixture, _________ is the sublimate.
What acts as a sublimate during sublimation of ammonium chloride and salt mixture?
Which technique is used to separate salt from the filtrate after sublimation of ammonium chloride?
Why is it difficult to separate salt and ammonium chloride mixture and sublimation is the only method to do so?
In the procedure of sublimation, the inverted funnel in plugged with cotton, because __________.
Which of the fractions will be present maximum in precipitate?
In the process of separation of ammonium chloride from the salt, ammonium chloride molecule ________.
Which of the following is not a way to separate the components of a mixture?
Sublimation is the procedure in which ___________.
Fractional crystallization is a method of refining substance based on difference on their:
Out of salt and ammonium chloride which compound do not evaporate?
Powdered chalk and sugar can be separated by addition of water.
Solid-solid mixtures are separated by:
Name a technique used to separate : Sodium chloride and sugar.
On heating ammonium chloride and salt, ammonium chloride changes into :
When sodium chloride and ammonium chloride are dissolved in water and filtered, what is the residue?
The solid which undergoes sublimation is called ________ , whereas the solid obtained by cooling vapors is called____________ .
Apart from salt and ammonium chloride, which other mixture can be separated by sublimation?
Ammonium chloride can be separated from sand by :
Which of the following will not show the property of sublimation?
Which of the following can undergo sublimation?
What is observed when a mixture of common salt and ammonium chloride is heated?
Why does the dish should be properly plugged during sublimation?
After sublimation of ammonium chloride, how can salt be separated from the filtrate?
Ammonium chloride doesnt actually undergo sublimation upon heating.
Non volatile substances can undergo sublimation.
All the impurities after crystallization are left behind in:
In fractional crystallization the proportion of components in the precipitate will depend on their solubility product.
A separating funnel is used to separate the components of a mixture of:
A public health inspector suspects that in addition to two harmless dyes (boiling points $69\ ^oC$ and $71\ ^oC$), a lollipop also contains a poisonous green dye (boiling point $73\ ^oC$). Which of the following can be used to confirm his suspicion?
John tried to separate sugar from its solution using the evaporation method. However, he was unsuccessful. Which of the following is the likely reason?
Sand that is needed for a project has some common salt accidentally mixed with it. which of the following processes need to be used to separate sand and salt?
1. Filtration
2. Evaporation
3. Distillation
4. Crystallisation