Which of the following can be used as an antacid?

K O H

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C a (O H)_{2}

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C a C O_{3}

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H_{2} C O_{3}

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Solution

The correct option is C $C a C O_{3}$
Following can be used as antacids: $A l (O H)_{3}, M g C O_{3}, M g (O H)_{2}, C a C O_{3}, N a H C O_{3}$ .
Antacids - By the name itself, antacids are the bases which neutralize acids, but it should be weakly basic [for body temperature].

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