KCET · Chemistry · General Principles and Processes of Isolation of Metals
When limestone is heated, \(\mathrm{CO}_{2}\) is given off. The metallurgical operation is
- A smelting
- B reduction
- C calcination
- D roasting
Answer & Solution
Correct Answer
(C) calcination
Step-by-step Solution
Detailed explanation
Calcination is the process of converting an ore into its oxide by heating it strongly below its melting point either in absence or limited supply of air. Carbonate ores are converted into their respective oxides by loss of carbon dioxide.
\(\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \underset{\text { calcium oxide }}{\mathrm{CaO}}+\mathrm{CO}_{2} \uparrow\)
\(\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \underset{\text { calcium oxide }}{\mathrm{CaO}}+\mathrm{CO}_{2} \uparrow\)
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
- \(0.023 \mathrm{~g}\) of sodium metal is reacted with \(100 \mathrm{~cm}^{3}\) of water. The \(\mathrm{pH}\) of the resulting solution isKCET 2011 Medium
- Ethyl alcohol is heated with concentrated sulphuric acid at 413 K . The major productKCET 2025 Easy
- Which one of the following is an intermediate in the reaction of benzene with \(\mathrm{CH}_{3} \mathrm{Cl}\) in the presence of anhydrous \(\mathrm{AlCl}_{3}\) ?KCET 2011 Easy
- \(25 \mathrm{~g}\) of each of the following gasses are taken at \(27^{\circ} \mathrm{C}\) and \(600 \mathrm{~mm}\) pressure. Which of these will have the least volume?KCET 2011 Easy
- One mole of ammonia was completely absorbed in one litre solution each of
(a) \( 1 \mathrm{M} \mathrm{HCl} \),
(b) \( 1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH} \) and
(c) \( 1 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4} \) at \( 298 \mathrm{~K} \).
The decreasing order for the \( \mathrm{pH} \) of the resulting solutions is
(Given \( \mathrm{K}_{b}\left(\mathrm{NH}_{3}\right)=4.74 \) )KCET 2014 Easy - Extraction of chlorine from brine solution is based onKCET 2017 Easy
More PYQs from KCET
- The value of \(\cot ^{-1}\left[\frac{\sqrt{1-\sin x}+\sqrt{1+\sin x}}{\sqrt{1-\sin x}-\sqrt{1+\sin x}}\right]\), where \(x \in\left(0, \frac{\pi}{4}\right)\) isKCET 2023 Hard
- The formula of penta aquanitrato chromium (III) nitrate is,KCET 2019 Easy
- Which one of the following statements is true?KCET 2010 Easy
- A motorboat covers a given distance in \(6 \mathrm{~h}\) moving downstream on a river. It covers the same distance in \(10 \mathrm{~h}\) moving upstream. The time it takes to cover the same distance in still water isKCET 2010 Medium
- If \( \left(x_{1}, y_{1}\right),\left(x_{2}, y_{2}\right) \) and \( \left(x_{3}, y_{3}\right) \) are the vertices of a triangle whose area is ' \( k \) ' square units,
then
\[
\left|\begin{array}{ccc}
x_{1} & y_{1} & 4 \\
x_{2} & y_{2} & 4 \\
x_{3} & y_{3} & 4
\end{array}\right|^{2} \text { is }
\]KCET 2018 Medium - The angle between the lines whose direction ratios are \(a, b, c\) and \(b - c, c - a, a - b\) isKCET 2026 Easy