Which one of the following statements about alkaline earth metals is N

Which one of the following statements about alkaline earth metals is NOT true ?

[amp_mcq option1=”Strontium salts burn with a red flame” option2=”Barium metal is used in medicine to examine the alimentary canal of a patient by X-ray” option3=”Green plants need magnesium in order to make the chlorophyll that trap the energy from sunlight in photosynthesis” option4=”Red colour of gemstone Ruby is due to the element beryllium present in it” correct=”option2″]

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UPSC CAPF – 2020

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The statement “Barium metal is used in medicine to examine the alimentary canal of a patient by X-ray” is NOT true.

For X-ray examination of the alimentary canal (Barium meal), a suspension of Barium *sulfate* (BaSO4) is used as a contrast medium. Barium sulfate is very insoluble and thus passes through the digestive system safely. Barium *metal* is highly reactive and toxic, and would react with water or acids in the body, making it unsuitable and dangerous for internal consumption or medical use in this manner.

A) Strontium salts (e.g., SrCl2) do burn with a red flame, used in fireworks. C) Magnesium is a crucial component of chlorophyll, essential for photosynthesis in green plants. D) The red colour of ruby is due to the presence of chromium ions (Cr3+) substituted into the aluminum oxide (Al2O3) lattice; beryllium is a component of other gemstones like emerald (which is beryl, a beryllium aluminum silicate, colored by chromium or vanadium). Statements A, C, and D are all factual statements (or factually correct denials, in the case of D’s claim about beryllium). Statement B is factually incorrect regarding the *form* of Barium used in medicine.

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