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D and F Block Elements question

2023 · 1 Feb · Shift 2 · Q16
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D and F Block Elements question

2023 · 1 Feb · Shift 2 · Q16

JEE MainChemistryD and F Block ElementsNumerical+4 / −1
Among following compounds, the number of those present in copper matte is ‾\underline{\hspace{2cm}}​. A. CuCO3\mathrm{CuCO_{3}}CuCO3​ B. Cu2S\mathrm{Cu_{2}S}Cu2​S C. Cu2O\mathrm{Cu_{2}O}Cu2​O D. FeO\mathrm{FeO}FeO
Numerical answer
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Correct answer: 1

  1. What is copper matte?

    In the extraction of copper from copper pyrites, the molten mass obtained after roasting and smelting is called copper matte.

    It mainly contains: Cu2SandFeS\mathrm{Cu_2S} \quad \text{and} \quad \mathrm{FeS}Cu2​SandFeS

  2. Check each given compound

    • A. CuCO3\mathrm{CuCO_3}CuCO3​

      Copper carbonate is not present in copper matte.

    • B. Cu2S\mathrm{Cu_2S}Cu2​S

      This is a main constituent of copper matte.

    • C. Cu2O\mathrm{Cu_2O}Cu2​O

      Cu2O\mathrm{Cu_2O}Cu2​O is formed in later stages (during conversion/self-reduction), but it is not a constituent of copper matte.

    • D. FeO\mathrm{FeO}FeO

      During smelting, FeO\mathrm{FeO}FeO reacts with silica to form slag: FeO+SiO2→FeSiO3\mathrm{FeO + SiO_2 \rightarrow FeSiO_3}FeO+SiO2​→FeSiO3​ Hence, FeO\mathrm{FeO}FeO is not present in copper matte.

  3. Count the compounds present in copper matte

    Only Cu2S\mathrm{Cu_2S}Cu2​S is present.

    Therefore, the required number is: 111

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