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A certain metal M is used to prepare an antiacid,which is used as a medicine in acidity. This metal accidently catches fire and it was found that the

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A certain metal M is used to prepare an antiacid,which is used as a medicine in acidity. This metal accidently catches fire and it was found that the fire cannot be put out by using `Co_2` based extinguishers. The metal M is
A. Ca
B. C
C. Mg
D. None
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Correct Answer - C
Both magnesium and calcium fires cannot be put only by using carbon dioxide based extinguishers. However Mg is used for preparing a suspension of `Mg(OH)_2` in water which is used as anti-acid. Hence, the metal M is Mg.
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