Download App

General Principles and Processes of Extraction of Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryGeneral Principles and Processes of Extraction of Elements2 Marks
Question
Why aluminium is used in aluminothermic process?
✓

Answer

Aluminium has great affinity for oxygen. Thus, it acts as a very good reducing agent. Moreover huge energy is released during this process. This process is used in the extraction of chromium and manganese from their oxides and also in thermite welding.
$ Cr_{2}O_{3}+2Al \xrightarrow{\Delta} Al_{2}O_{3} + 2Cr $.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Short Answer Type Questions [2M]" from General Principles and Processes of Extraction of Elements→General Principles and Processes of Extraction of Elements — all question types→Chemistry STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Explain the preparation of aldehydes and ketones by oxidation of alcohols with suitable examples.
→
Explain Hell-Volhard-Zelinsky reaction of carboxylic acids.
→
Explain the fact that in aryl alkyl ethers (i) the alkoxy group activates the benzene ring towards electrophilic substitution and (ii) it directs the incoming substituents to ortho and para positions in benzene ring.
→
Give reasons for the following:
Glucose and fructose give the same osazone.
→
Faraday's first law of electrolysis.
→
Benzaldehyde can be obtained from benzal chloride. Write reactions for obtaining benzalchloride and then benzaldehyde from it.
→
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
  1. Both assertion and reason are true and the reason is the correct explanation of assertion.
  2. Both assertion and reason are true and the reason is not the correct explanation of assertion.
  3. Assertion is true but the reason is false.
  4. Both assertion and reason are false.
  5. Assertion is false but reason is true.
Assertion: For measuring resistance of an ionic solution an AC source is used.
Reason: Concentration of ionic solution will change if DC source is used.
→
Account for the following:
  1. Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.
  2. pKa value of 4-nitrobenzoic acid is lower than that of benzoic acid.
→
What are isomers? Explain the types of isomerism.
→
Give the structure of A, B and C in the following reaction:

$\text{CH}_3\text{CH}_2\text{I}\xrightarrow[]{\text{NaCN}}\text{A}\xrightarrow[\text{Partial hydolysis}]{\text{OH}^+}\text{B}\xrightarrow[]{\text{NaOH}+\text{Br}_2}\text{C}$

→