Q36 / 160 · AP EAMCET 2020 (18 Sep Shift 1) · Chemistry

Match the items of List-I with those of List-II and choose the correct option given below. \(\begin{array}{|c|c|} \hline \text { List-I } & \text { List-II } \\ \hline \text { A. Calcination } & \text { 1. Galena } \\ \hline \text { B. Roasting } & \text { 2. Magnetite } \\ \hline \text { C. Magnetic separation } & \text { 3. Pyrometallurgy } \\ \hline \text { D. Carbon reduction of metal oxide } & \text { 4. Malachite } \\ \hline \end{array}\)

  • A
    \(\begin{array}{llll} \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 4 & 1 & 3 & 2 \end{array}\)
  • Correct answer
    B
    \(\begin{array}{cccc} \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 4 & 1 & 2 & 3 \end{array}\)
  • C
    \(\begin{array}{llll} \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 2 & 4 & 3 & 2 \end{array}\)
  • D
    \(\begin{array}{cccc} \mathrm{A} & \mathrm{B} & \mathrm{C} & \mathrm{D} \\ 3 & 2 & 1 & 4 \end{array}\)

Solution

(A) Calcination For hydrated carbonate or bicarbonate ores \(\Rightarrow(4)\) malachite, \(\mathrm{CuCO}_3 \cdot \mathrm{Cu}(\mathrm{OH})_2\) (B) Roasting For sulphide ores \(\Rightarrow\) (1) galena, \(\mathrm{PbS}\) (C) Magnetic separation For magnetic ore or gangue \(\Rightarrow\) (2) magnetite, \(\mathrm{Fe}_3 \mathrm{O}_4\) (D) Carbon reduction of metal oxide It is done is furnaces on application of heat \(\Rightarrow\) (3) pyrometallurgy The correct matching is (A)-(4), (B)-(1), (C)-(2), (D)-(3)

Hence, the correct answer is option: 'B'.

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