Chemistry
Why is water not suitable for putting out a petrol fire ?

Water, being heavy, slips below petrol which thus remains in contact with air and burns
Petrol is too inflammable to be extinguished by water
The heat required for combustion of petrol is very low
The oxygen content of water is isolated by petrol and thus it helps in burning

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Chemistry
Antacid tablets consist of

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

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