According to many, including the Guinness Book of World Record,________is the world’s rarest mineral?

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2. The name of the common mineral salt present in sweat is ?

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3. Which one of the following is a non-metallic mineral?

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4. About 50% of the Earth’s crust, including the waters on the Earth and atmosphere, is?

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6. Name the famous book of Ibn-Sina in which he discussed human physiology and medicine ?

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10. According to Quark theory, there are _________ elementary particles.

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