Chemistry
Cyanide poisoning causes death in seconds because

It causes Lysis of red blood cells
It causes cardiac arrest
It breaks the electron transport chain
It denatures enzymes of the heart/muscle

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Chemistry
Antacid tablets consist of

Hydroxides of magnesium and sodium
Hydroxides of sodium, magnesium and aluminium
Hydroxides of magnesium and aluminium
Hydroxides of sodium and aluminium

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