KCET · Chemistry · General Principles and Processes of Isolation of Metals
The incorrect statement about Hall -Heroult process is
- A carbon anode is oxidised to CO and \(\mathrm{CO}_2\).
- B \(\mathrm{Na}_3 \mathrm{AlF}_6\) helps to decrease the melting point of the electrolyte.
- C \(\mathrm{CaF}_2\) helps to increase the conductivity of the electrolyte.
- D oxidation state of oxygen changes in the overall cell reaction.
Answer & Solution
Correct Answer
(D) oxidation state of oxygen changes in the overall cell reaction.
Step-by-step Solution
Detailed explanation
The incorrect statement about Hall-Heroult process is given in option (d). It is because in this process oxidation state of oxygen remains same in the overall cell reaction.
\(2 \mathrm{Al}_2 \mathrm{O}_3+3 \mathrm{C} \longrightarrow 4 \mathrm{Al}+3 \mathrm{CO}_2\)
\(2 \mathrm{Al}_2 \mathrm{O}_3+3 \mathrm{C} \longrightarrow 4 \mathrm{Al}+3 \mathrm{CO}_2\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- The electrolyte having maximum flocculation value for \( A g l / A g^{+} \)sol. isKCET 2015 Easy
- The first ionization enthalpy of the following elements are in the order:KCET 2019 Easy
- Chloroacetic acid is a stronger acid than acetic acid. This can be explained usingKCET 2010 Easy
- The correct set of four quantum numbers for the outermost electron of sodium \((Z=11)\) isKCET 2012 Easy
- The female sex hormone which is responsible for the development of secondary female characteristics and participates in the control of menstrual cycle isKCET 2024 Easy
- \( \mathrm{CO} \) is a stronger ligand than \( \mathrm{Cl}^{-} \), becauseKCET 2016 Easy
More PYQs from KCET
- During protein synthesis AUG functions as the initiator codon in mRNA. What should be the anticodon on the tRNA molecule that picks up and brings the amino acid specified by this codon?KCET 2005 Medium
- The energy of electron in the \( n^{\text {th }} \) Bohr orbit of H-atom isKCET 2016 Easy
- The sum of the degree and order of the differential equation \(\left(1+y_1^2\right)^{2 / 3}=y_2\) isKCET 2022 Easy
- \(\cot ^{-1}\left(2 \cdot 1^{2}\right)+\cot ^{-1}\left(2 \cdot 2^{2}\right)+\cot ^{-1}\left(2 \cdot 3^{2}\right)+\ldots\) upto \(\infty\) is equal toKCET 2009 Hard
- The embryo sac of an angiosperm is made up ofKCET 2013 Hard
- The basic principle of Cottnell's precipitator isKCET 2008 Easy