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How could you separate tellurium dioxide (TeO2) from SiO2? SiO2 is insoluble, and TeO2 is soluble. Once again, add water, decant to remove SiO2, and boil off to separate TeO2.Zinc chloride can be separated from the mixture of the silicon dioxide by dissolving the silicon dioxide in a suitable solvent i.e. the water or the organic solvent i.e. the ethanol.
…
Tellurium dioxide.
| Names | |
|---|---|
| Melting point | 732 °C (1,350 °F; 1,005 K) |
| Boiling point | 1,245 °C (2,273 °F; 1,518 K) |
| Solubility in water | negligible |
| Solubility | soluble in acid and alkali |
Contents
How could you separate zinc chloride from SiO2 zinc chloride is soluble in water and SiO2 is insoluble in water?
Zinc chloride can be separated from the mixture of the silicon dioxide by dissolving the silicon dioxide in a suitable solvent i.e. the water or the organic solvent i.e. the ethanol.
Is tellurium dioxide soluble in water?
…
Tellurium dioxide.
| Names | |
|---|---|
| Melting point | 732 °C (1,350 °F; 1,005 K) |
| Boiling point | 1,245 °C (2,273 °F; 1,518 K) |
| Solubility in water | negligible |
| Solubility | soluble in acid and alkali |
How could you separate zinc chloride from SiO2 assuming zinc chloride has similar properties to that of salt?
How could you separate zinc chloride from SiO2? Add water to the mixture, dissolve the zinc chloride, and then filter to separate the zinc chloride from the SiO2.
What property allows you to separate NaCl from SiO2?
(b) SOLUBILITY
Extracting (dissolving) a soluble substance out of a mixture with a appropriate solvent is a common separation technique. In this experiment you will use solubility to extract a solid, NaCl, which is soluble in water, from another solid, SiO2, which is insoluble in water.
What is TeO2 soluble in?
| Properties | |
|---|---|
| Melting point | 733 °C |
| Boiling point | 1245 °C |
| Solubility in water | negligible |
| Solubility | soluble in acid and alkali |
Is TeO2 polar?
Tellurium oxide is probably polar covalent; tellurium is of moderate electronegativity and oxygen is of high electronegativity. Lithium chloride is definitely ionic as per rule 3.
Why TeO2 is an oxidising agent?
Thus, +4 oxidation state of `TiO_(2)` is less stable than its +2 oxidation state. As a result, it accepts electrons and thus acts an oxidising agent.
Is zinc chloride soluble in water?
Zinc ammonium chloride forms colorless, transparent crystals, without odor and having an intensely caustic taste. It is readily and completely soluble in water; the aqueous solution is acid to litmus; the solution remains permanently clear.
How do you separate ammonium chloride and zinc chloride?
It has now been found that the zinc and ammonia values can be efficiently recovered from aqueous solutions containing zinc chloride or zinc monoammine chloride and ammonium chloride by adding ammonia and separating the solid, insoluble zinc diammine chloride phase that forms from the aqueous ammonium chloride solution …
What separation technique is used to separate a mixture of benzophenone and a naphthol?
How could you separate benzophenone from a-naphthol? Benzophenone is soluble in cyclohexane, and a-naphthol is not. Add cyclohexane, decant the a-naphthol, and boil off to separate benzophenone.
How could you separate barium sulfate from ammonium chloride?
Dissolve the mixture in water. NH4Cl is soluble in water, BaSO4 is insoluble. Filter to separate BaSO4 as solid and NH4Cl as solution NH4Cl(aq).
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How could you separate zinc chloride from SiO2 class 11 chemistry CBSE
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Contents
Preparation[edit]
Physical properties[edit]
Chemical properties[edit]
Structure[edit]
Uses[edit]
Safety[edit]
References[edit]
External links[edit]
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Separation of mixture – TeO2 and SiO2
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How could you separate zinc chloride from SiO2 class 11 chemistry CBSE
Hint: By using the concept of solubility, we can easily separate the zinc chloride from the mixture of silicon dioxide as silicon dioxide is insoluble in water. Now answer the statement.
Complete answer:
First let’s discuss silicon dioxide. Silicon dioxide is an inorganic compound and is formed by the action of the oxygen on the silicon and has weak solubility in water and doesn’t dissolve into it.
On the other hand, zinc chloride consists of the zinc and chlorine and is formed by the action of the chlorine on the zinc metal.
Now considering the statement as;
Zinc chloride can be separated from the mixture of the silicon dioxide by dissolving the silicon dioxide in a suitable solvent i.e. the water or the organic solvent i.e. the ethanol.
It is so because when we dissolve the mixture of the zinc chloride and the silicon dioxide in water, then the silicon dioxide, being an inorganic compound , is insoluble in water and does not dissolve in the water and by the process of the filtration, we can easily separate the silicon dioxide from it.
Now, the resultant solution consists only of the zinc chloride.
Hence, in this way, we can quickly and easily separate the zinc chloride from the silicon dioxide.
Note:
Mixtures are those substances which consist of two or more compounds and these mixtures can be easily separated through the physical methods such as filtration, crystallization, fractional distillation etc.
Tellurium dioxide
Chemical compound
Tellurium dioxide (TeO 2 ) is a solid oxide of tellurium. It is encountered in two different forms, the yellow orthorhombic mineral tellurite, β-TeO 2 , and the synthetic, colourless tetragonal (paratellurite), α-TeO 2 .[2] Most of the information regarding reaction chemistry has been obtained in studies involving paratellurite, α-TeO 2 .[3]
Preparation [ edit ]
Paratellurite, α-TeO 2 , is produced by reacting tellurium with O 2 :[2]
Te + O 2 → TeO 2
An alternative preparation is to dehydrate tellurous acid, H 2 TeO 3 , or to thermally decompose basic tellurium nitrate, Te 2 O 4 ·HNO 3 , above 400 °C.[2]
Physical properties [ edit ]
The longitudinal speed of sound in Tellurium dioxide is 4,260 metres per second (14,000 ft/s) at around room temperature.[4]
Chemical properties [ edit ]
TeO 2 is barely soluble in water and soluble in strong acids and alkali metal hydroxides.[5] It is an amphoteric substance and therefore can act both as an acid or as a base depending on the solution it is in.[6] It reacts with acids to make tellurium salts and bases to make tellurites. It can be oxidized to telluric acid or tellurates.
Structure [ edit ]
Paratellurite, α-TeO 2 , converts at high pressure into the β-, tellurite form.[7] Both the α-, (paratellurite) and β- (tellurite forms) contain four coordinate Te with the oxygen atoms at four of the corners of a trigonal bipyramid. In paratellurite all vertices are shared to give a rutile-like structure, where the O-Te-O bond angle are 140°. α-TeO 2 In tellurite pairs of trigonal pyramidal, TeO 4 units, sharing an edge, share vertices to then form a layer.[7] The shortest Te-Te distance in tellurite is 317 pm, compared to 374 pm in paratellurite.[7] Similar Te 2 O 6 units are found in the mineral denningite.[7]
TeO
2 melts at 732.6 °C, forming a red liquid.[8] The structure of the liquid, as well as the glass which can be formed from it with sufficiently rapid cooling, are also based on approximately four coordinate Te. However, compared to the crystalline forms, the liquid and glass appear to incorporate short-range disorder (a variety of coordination geometries) which marks TeO 2 glass as distinct from the canonical single-oxide glass-formers such as SiO 2 , which share the same short-range order with their parent liquids.[9]
Uses [ edit ]
It is used as an acousto-optic material.[4]
Tellurium dioxide is also a reluctant glass former, it will form a glass under suitable cooling conditions,[10] or with small molar% additions of a second compound such as an oxide or halide. TeO 2 glasses have high refractive indices and transmit into the mid-infrared part of the electromagnetic spectrum, therefore they are of technological interest for optical waveguides. Tellurite glasses have also been shown to exhibit Raman gain up to 30 times that of silica, useful in optical fibre amplification.[11]
Safety [ edit ]
TeO 2 is a possible teratogen.[12]
Exposure to tellurium compounds produces a garlic-like odour on the breath, caused by the formation of ethyl telluride.[13]
Separation of mixture – TeO2 and SiO2
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How could you separate tellurium dioxide, TeO2 from silicon dioxide SiO2?
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Solution Preview Mixtures can be separated into their constituents by using physical methods (i.e. no chemical reaction involved). Separation techniques are physical methods. Which technique to use depends on the different properties of the constituents. That is, different states,solubility, boiling and melting points. Basically the plan is to …
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