Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

Unburnt petrol
CO2
CO
SO2

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Chemistry
Antacid tablets consist of

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

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