Which of the processes is used in thermite welding ?
- $ {TiO_{2} +4Na -> Ti + 2Na2O} $
- $ {2Al + Fe2O3 -> Al2Oa3 + 2Fe} $
- $ {SnO2 + 2C -> Sn + 2CO} $
- $ {CrO3 + 2Al -> Al2O3 + 2Cr} $
The Correct Option is B
Solution and Explanation
Thus, $2Al+Fe_{2}O_{3} \to Al_{2}O_{3}+2Fe$ is used in thermite welding
Top Questions on General Principles and Processes of Isolation of Elements
- On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed ?
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- Given below are two statements:
Statement I : During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode
Statement II : During the Hall-Heroult electrolysis process, purified $Al _2 O _3$ is mixed with $Na _3 AlF _6$ to lower the melting point of the mixture
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The reaction that does NOT take place in a blast furnace between 900 K to 1500 K temperature range during extraction of iron is?
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B. Order of stability of oxides of halogens is I > Br > Cl
C. I2O5 is used in the estimation of CO
D. ClO2; is used as a bleaching agent
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Concepts Used:
General Principles and Processes of Isolation of Elements
What are Ores and Minerals?
Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.
Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore.
Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –
- Concentration of the ore
- Isolation of the metal from its concentrated ore
- Purification of the metal