KCET · Chemistry · General Principles and Processes of Isolation of Metals
Which one of the following statements is false?
- A During roasting, moisture is removed from the ore
- B The ore is freed from almost all non-metallic impurities
- C Calcination of ore is carried out in the absence of any blast of air
- D The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy
Answer & Solution
Correct Answer
(D) The concentrated zinc blende is subjected to calcination during its extraction by pyrometallurgy
Step-by-step Solution
Detailed explanation
In pyrometallurgy of \(\mathrm{Zn}, \mathrm{ZnS}\) is subjected to roasting.
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
- Equilibrium constants \( K_{1} \), and \( K_{2} \) for the following equilibria
(a) \( \mathrm{NO}(g)+\frac{1}{2} \mathrm{O}_{2}(g) \rightleftharpoons \mathrm{NO}_{2}(g) \)
(b) \( 2 \mathrm{NO}_{2}(g) \rightleftharpoons 2 \mathrm{NO}(g)+\mathrm{O}_{2}(g) \)
are related as :KCET 2016 Medium - Lower members of aliphatic carboxylic acidare soluble in water. This is due toKCET 2017 Easy
- For a stable molecule, the value of bond order must beKCET 2007 Easy
- The number of disulphide linkages present in insulin areKCET 2013 Medium
- In the electrolytic refining of zincKCET 2010 Easy
- In chrysoberyl, a compound containing beryllium, aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy \(\frac{1}{4}\) th of octahedral voids. The formula of the compound isKCET 2021 Medium
More PYQs from KCET
- Entropy of the universe isKCET 2007 Medium
- The value of \(\int_{0}^{4042} \frac{\sqrt{x} d x}{\sqrt{x}+\sqrt{4042-x}}\) is equal toKCET 2021 Easy
- A mixture of \(\mathrm{CaCl}_{2}\) and \(\mathrm{NaCl}\) weighing \(4.44 \mathrm{~g}\) is treated with sodium carbonate solution to precipitate all the \(\mathrm{Ca}^{2+}\) ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get \(0.56 \mathrm{~g}\) of \(\mathrm{CaO}\). The percentage of \(\mathrm{NaCl}\) in the mixture (atomic mass of \(\mathrm{Ca}=40\) ) isKCET 2010 Medium
- If \([x]\) is the greatest integer function not greater than \(x\), then \(\int_0^8[x] d x\) is equal toKCET 2022 Medium
- The value of \(\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}\) isKCET 2021 Medium
- A horizontal pipe carries water in a streamlined flow. At a point along the pipe, where the cross-sectional area is \(10 \mathrm{~cm}^{-2}\), the velocity of water is \(1 \mathrm{~ms}^{-1}\) and the pressure is 2000 Pa . What is the pressure of water at another point where the cross-sectional area is \(5 \mathrm{~cm}^2\) ?
[Density of water \(=1000 \mathrm{kgm}^{-3}\) ]KCET 2025 Medium