Asbestos is hydrated _ magnesium silicate.
Correct answer: D. Iron
- A. Calcium
- B. Aluminium
- C. Barium
- D. Iron
Explanation
Explanation:The correct answer is calcium because asbestos is a term used to describe a group of six naturally occurring fibrous minerals that are composed of hydrated magnesium silicate and other elements. While there are silicate minerals that contain aluminium, such as kaolinite and feldspar, asbestos is not composed of hydrated aluminum silicate. Asbestos is not compsed of hydrated barium silicate, but there are silicate minerals that contain barium, such as barite. Asbestos is not composed of hydrated carbon silicate, but there are silicate minerals that contain carbon, such as serpentine.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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