Chemistry
The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

6.023 x 1023
1.568 x 103
4.84 x 1017
6.023 x 1019

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Chemistry
Antacid tablets consist of

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

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