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

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

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Chemistry
A solution is

A mixture of two liquids
A solid dissolved i water
A solid dissolved in a liquid
A homogeneous mixture of two or more substances

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