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Railways General Science & Technology Metals and Non-metals / धातु और अधातु Sample Paper Properties and Uses of Metals and Non-Metals Sample Test Paper-19

  • question_answer
    Calcium metal tarnishes in air due to the formation of

    A)  Calcium oxide

    B)  calcium bicarbonate

    C)  Calcium hydroxide

    D)  calcium carbonate

    Correct Answer: D

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