AP EAMCET · Chemistry · General Principles and Processes of Isolation of Metals
Which statement is incorrect regarding Hall-Heroult process for metallurgy of aluminium?
1. Use of \(\mathrm{Na}_3 \mathrm{AlF}_6\) lowers the melting point of \(\mathrm{Al}_2 \mathrm{O}_3\)
2. Steel vessel with lining of carbon acts as cathode.
3. Graphite is used as anode.
4. Carbon dioxide gas is generated at cathode.
- A 1
- B 2
- C 3
- D 4
Answer & Solution
Correct Answer
(D) 4
Step-by-step Solution
Detailed explanation
In Hall-Heroult process for extraction of aluminium (crude) from alumina \(\left(\mathrm{Al}_2 \mathrm{O}_3\right)\). Statements (1), (2) and (3) are correct because cryolite \(\left(\mathrm{Na}_3 \mathrm{AlF}_6\right)\) is added to \(\mathrm{Al}_2 \mathrm{O}_3\) to lower, its…
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
- Nitrobenzene on reduction using zinc in alkaline medium results in \(X\). The number of \(\operatorname{sigma}(\sigma)\) and pi \((\pi)\) bonds in \(X\) isAP EAMCET 2011 Medium
- Among the following options, identify the one which exhibits the greatest number of oxidation states.AP EAMCET 2021 Easy
- If \(\mathrm{K}_{\mathrm{C}}\) for the equilibrium reaction \(2 \mathrm{ABC}(g) \rightleftharpoons 2 \mathrm{AB}(g)+\mathrm{C}_2(g)\) is X at \(\mathrm{T}(\mathrm{K})\), its \(\mathrm{K}_{\mathrm{P}}\) at the same temperature is :AP EAMCET 2017 Easy
- Arrange the following molecules according to decreasing order of their \(\mathrm{O}-\mathrm{O}\) bond lengths.AP EAMCET 2021 Medium
- Assertion (A) All noble gases are monoatomic.
Reason (R) All noble gases have very low melting and boiling points.AP EAMCET 2022 Easy - Identify \(B\) in the following reaction
\(\mathrm{H}_4 \mathrm{SiO}_4 \underset{-\mathrm{H}_2 \mathrm{O}}{\stackrel{1000{ }^{\circ} \mathrm{C}}{\longrightarrow}} A \underset{\Delta}{\stackrel{\text { Carbon }}{\longrightarrow}} B+\mathrm{CO}\)AP EAMCET 2008 Hard
More PYQs from AP EAMCET
- An aryl carboxylic acid on treatment with sodium hydrogen carbonate liberates a gaseous molecule. Identify the gas molecule liberated.AP EAMCET 2022 Medium
- The correct order of bond enthalpy of given molecules isAP EAMCET 2023 Easy
- A point \(P(x, y)\) is such that the sum of squares of its distances from the co-ordinate axes is equal to the square of its distance
from the line \(x-y=1\). Then the equation of the locus of \(P\) isAP EAMCET 2020 Medium - If \(\lim _{x \rightarrow \infty}\left(1+\frac{p}{x}\right)^{q x}=e^9\) where \(p, q \in \mathbf{N}\) then \(p+q=\)AP EAMCET 2020 Medium
- \(\lim _{x \rightarrow 0} \frac{1-\cos x}{x^2}=\)AP EAMCET 2020 Easy
- If three numbers are drawn at random successively without replacement from a set \(S=\{1,2, \ldots 10\}\), then the probability that the minimum of the chosen numbers is 3 or their maximum is 7 .AP EAMCET 2017 Medium