JEE Main & Advanced Chemistry Metallurgy Question Bank Critical Thinking Question

  • question_answer 'Lapis-Lazuli' is a blue coloured precious  stone. It is mineral of the class [NCERT 1980; AIIMS 1980; BHU 1978, 80]

    A) Sodium-alumino silicate

    B) Zinc cobaltate

    C) Basic copper carbonate

    D) Prussian blue

    Correct Answer: A

    Solution :

    Lapis lazuli is the aluminium silicate present in earth rocks as blue stone.

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