Question

Sand, Chalk and Oil have one common property with respect to water. What is that?

(a) These doesn‟t dissolve into the water

(b) These are useless for us

(c) These dissolve into the water

(d) These have similar fragrance

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Answer 1

these doesn't dissolve into water

Explanation:

Sand will not dissolve in water because the "bond" of water is not strong enough to dissolve the sand. However, some strong acids can dissolve sand. Dissolution will proceed faster in warmer water, because it has more room for the molecules of the salt to “fit” between the molecules of water.

Chalk is insoluble in water.It comprises of CaCO3 and as the Ca and Carbonate bond are very tightly bonded with each other and thus chalk remain in its crystal structure when you put in water.

Liquid water has fewer hydrogen bonds than ice.) ... Oils and fats not have any polar part and so for them to dissolve in water they would have to break some of water hydrogen bonds. Water will not do this so the oil is forced to stay separate from the water.

Answer 2

Sand, Chalk and Oil have one common property with respect to water. That is (a) These doesn't dissolve into the water

• Sand doesn't dissolve with water instead, it sinks at the bottom. Even if the mixture is stirred for long hours, the grains remain suspended at the bottom. Such a type of mixture is called Suspension.
• Chalk is made of Calcium Carbonate. Due to strong bonding in Calcium Carbonate, it doesn't solubilise in water and remains in a crystal state.
• Oil and water are immiscible with each other. When oil is poured over water it forms a separate layer and doesn't dissolve.
• Hence, Sand, Chalk and Oil don't dissolve in water.