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Combustion

The density o...

Question

The density of water is 1 g/cm³. If each of these liquids X, Y and Z is immiscible in water, which of them will float on water.

Liquid Mass (g) Volume (cm³)

X 5.4 5

Y 46 50

Z 130 100

(a) Liquid Y will float.
(b) Liquid X and Z will float.
(c) All the three liquids will float.
(d) None of them will float on water.

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Solution

The density of water is 1 g/cm³. If each of these liquids X, Y and Z is immiscible in water, then to know which of them will float on water, we need to find their densities using the formula 'Density = Mass / Volume'.

Liquid Mass (g) Volume (cm³) Density (g/cm³)

X 5.4 5 5.4 / 5 = 1.08

Y 46 50 46 / 50 = 0.9

Z 130 100 130 / 100 = 1.3

(a) True

Liquid Y will float because its density is less than the density of water.
(b) False
The liquids X and Z are denser than water. Hence they will sink in water.

(c) False
The liquids X and Z are denser than water. Hence they will sink in water

(d) False
Liquid Y will float because its density is less than the density of water.

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