Chemistry
Food cans are coated with tin and not with zinc because

Zinc has a higher melting point than tin
Zinc is costlier than tin
Zinc is more reactive than tin
Zinc is less reactive than tin

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Chemistry
Antacid tablets consist of

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

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