Which substance are highly soluble in water. 1. Iron and glass 2. Wood and salt 3. Sugar and salt 4. Wood and sugar?

The answer is option 3 that is Sugar and salt.

Sugar and salt are highly soluble in water while the other options that is of Iron, glass and Wood are insoluble in water.

Only sugar and salt are soluble in water.

For salt solubility there is different charge of sodium and chlorine that attract positive and negative area of water while for sugar, polar sucrose form intermolecular bond with water that makes it soluble.

Answer: Sugar and Salt!