Metallurgy · Chemistry · TS EAMCET
MCQ (Single Correct Answer)
Composition of siderite ore is
The ore of which metal is concentrated by leaching?
Observe the following statements
Statement I : The choice of reducing agent for the reduction of an oxide ore can be predicted by using Ellingham diagram, a plot of $\Delta G^{\ominus}$ vs $T$.
Statement II : According to Ellingham diagram, metal oxide with higher $\Delta G^{\ominus}$ is more stable than the oxide with lower $\Delta G^{\ominus}$.
The correct answer is
In the extraction of iron using blast furnace to remove the impurity $(X)$, chemical $(Y)$ is added to the ore. $X$ and $Y$ are respectively
Metal $X$ obtained from sphalarite ore can be purified by which of the following method?
Identify the reaction, which is not related to extraction of copper
Match the following
| List I (Alloy) | List II (Use) |
| A Li-Pb | I. In aircraft construction |
| B Be-Cu | II. To make bearings for motor engines |
| C Mg-Al | III. To make tetraethyl lead |
| D Na-Pb | IV. To make high strength springs |
The correct answer is
"Observe the following reaction. This reaction represents
$$ 4 \mathrm{HCl}+\mathrm{O}_2 \xrightarrow[723 \mathrm{~K}]{\mathrm{CuCl}_2} 2 \mathrm{Cl}_2+2 \mathrm{H}_2 \mathrm{O} $$"
The metal which is refined by Mond process is $(X)$, by van Arkel process is $(Y)$ and by zone refining is $(Z), X, Y$ and Z respectively are
The ore which is purified by leaching process is
$$ \begin{aligned} 4 \mathrm{Ag}(s)+8 \mathrm{CN}^{-}(a q) & +2 \mathrm{H}_2 \mathrm{O}(a q)+\mathrm{O}_2(g) \longrightarrow 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+4 \mathrm{OH}^{-}(a q) \end{aligned} $$
The above reaction represents the process of concentration of ore in the extraction of silver. The process is
Ellingham diagram is the plot of $X$ vs $Y$, what are $X$ and $Y$ ?
$$ \text { Match the following. } $$
$$ \begin{array}{llll} \hline & \begin{array}{c} \text { List-I } \\ \text { (Refining method) } \end{array} & & \begin{array}{c} \text { List-II } \\ \text { (Metals to be refined) } \end{array} \\ \hline \text { (A) } & \text { Zone refining } & \text { (I) } & \text { Titanium } \\ \hline \text { (B) } & \text { Poling } & \text { (II) } & \text { Tin } \\ \hline \text { (C) } & \text { Liquation } & \text { (III) } & \text { Gallium } \\ \hline \text { (D) } & \text { Vapour phase refining } & \text { (IV) } & \text { Copper } \\ \hline \end{array} $$
The correct answer is
Which element does not exist in elemental state in the earth's crust?
Which one of the following statements is true about the froth flotation method?
In the following reactions, identify $P, Q$ and $R$, respectively
I. $3 \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 P+\mathrm{CO}_2 \uparrow$
II. $\mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{CO} \longrightarrow 3 Q+4 \mathrm{CO}_2 \uparrow$
III. $\mathrm{Fe}_2 \mathrm{O}_3+\mathrm{CO} \longrightarrow 2 R+\mathrm{CO}_2 \uparrow$
The method, which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called
The solubilities of the impurities in the melt and solid states is not same. This principle is applied during the extraction of boron. This method is known as
$$ \text { Match the following. } $$
$$ \begin{array}{llll} \hline & \text { Ores } & & \text { Composition } \\ \hline \text { A. } & \text { Calamine } & \text { (i) } & \mathrm{CuFeS}_2 \\ \hline \text { B. } & \text { Chalcopyrite } & \text { (ii) } & \mathrm{ZnCO}_3 \\ \hline \text { C. } & \text { Bauxite } & \text { (iii) } & \mathrm{Fe}_2 \mathrm{O}_3 \\ \hline \text { D. } & \text { Haematite } & \text { (iv) } & \mathrm{Al}_2 \mathrm{O}_3 \cdot 2 \mathrm{H}_2 \mathrm{O} \\ \hline \end{array} $$
$$ \text { The correct match is } $$
Which one of the following ores does not contain iron?