NEET Chemistry Metallurgy / धातुकर्म Question Bank Self Evaluation Test - General Principals and Process of Isolation of Elements

  • question_answer
    Pb and Sn are extracted from their chief ore by

    A) carbon reduction and self reduction.

    B) self reduction and carbon reduction.

    C) electrolysis and self reduction.

    D) self-reduction and electrolysis.

    Correct Answer: B

    Solution :

    [b] \[PbO\And PbS{{O}_{4}}\] get reduced by PbS itself which is already present in mixture so because the reduction took place by itself hence is known as self-reduction. \[2PbO+PbS\xrightarrow{\Delta }3Pb+S{{O}_{2}}\uparrow \] \[PbS{{O}_{4}}+PbS\xrightarrow{\Delta }2Pb+2S{{O}_{2}}\uparrow \]


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