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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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

The flame is too hot for water to cool it down
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
Water and petrol are miscible with each other
Water and petrol react chemically

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