Regarding cryolite incorrect statement is

a)
It is an ore of Al

b)
The non-metal is fluorine

c)
It is used in aluminium extraction from bauxite

d)
Its formula is 3NaF. AIF₃

Correct answer is option 'D'. Can you explain this answer?

Question

Regarding cryolite incorrect statement is

a)
It is an ore of Al
b)
The non-metal is fluorine
c)
It is used in aluminium extraction from bauxite
d)
Its formula is 3NaF. AIF₃

Correct answer is option 'D'. Can you explain this answer?

Answer

Cryolite, colourless to white halide mineral, sodium aluminum fluoride (Na3AlF6). It occurs in a large deposit at Ivigtut, Greenland, and in small amounts in Spain, Colorado, U.S., and elsewhere.It was historically used as an ore of aluminium and later in the electrolytic processing of the aluminium-rich oxide ore bauxite (itself a combination of aluminium oxide minerals such as gibbsite, boehmite and diaspore)

Answer

Correct answer is d coz cryolite is Na3AlF6 which is used in the extraction of aluminum . It is one of the component of the electrolyte in heroult process and is used to lower the melting point of alumina and hence increases conductivity

Answer

Explanation:
Cryolite is a mineral that is commonly used in the extraction of aluminum from bauxite. It is a sodium aluminum fluoride compound with the chemical formula Na3AlF6.

Incorrect Statement:
The incorrect statement is option D, which states that the non-metal in cryolite is fluorine.

Correct Statement:
The correct statement is that the non-metal in cryolite is aluminum.

Explanation of Cryolite:
Cryolite is an important mineral in the aluminum industry because it has a low melting point and can dissolve alumina (Al2O3) at high temperatures. This property makes it an ideal electrolyte in the Hall-Héroult process, which is used to extract aluminum from bauxite.

Composition and Formula:
The chemical formula of cryolite is Na3AlF6, which means it is composed of three sodium (Na) ions, one aluminum (Al) ion, and six fluoride (F) ions. This formula reflects the ratio of the ions present in the mineral.

Role in Aluminum Extraction:
Cryolite plays a crucial role in the extraction of aluminum from bauxite. In the Hall-Héroult process, a mixture of alumina (Al2O3) and cryolite is dissolved in a molten state, forming an electrolyte. The cryolite lowers the melting point of the mixture, allowing it to be electrolyzed at a lower temperature.

During the electrolysis process, electric current is passed through the molten mixture, causing the aluminum ions to be reduced and deposited at the cathode, while oxygen is liberated at the anode. Cryolite helps to conduct electricity, maintain the molten state of the mixture, and increase the efficiency of the aluminum extraction process.

Conclusion:
In summary, cryolite is an important mineral used in the extraction of aluminum from bauxite. Its chemical formula is Na3AlF6, and it acts as an electrolyte in the Hall-Héroult process. The incorrect statement in the given options is that the non-metal in cryolite is fluorine, whereas the correct statement is that the non-metal is aluminum.

Answer

Na3AlF6 (or) 3NaF.AlF3 is the formula for cryolite.
so the correct option should be (C) instead of (D).

Similar Class 12 Doubts

Regarding cryolite incorrect statement is

Statement TypeThis section is based on Statement I and Statement II. Select the correct anser from the codes given below.Q.Statement I : The copper pyrite (CuFeS2) is the ore of copper.Statement II : The clay (Al2O3.2SiO2.2H2O) is the ore of aluminium.

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