Question

Which of the following is/are soluble in water?
This question has multiple correct options
(A) Ghee
(B) Curd
(C) Blood
(D) Sugar

Answer 1

Hint: Apply the principle of ‘like dissolves like’. Polar solutes dissolve in polar solvents. Nonpolar solutes dissolve in nonpolar solvents.

Complete answer:
> Water has a dipole moment and is a polar compound. It can form intermolecular hydrogen bonds which lead to molecular association.
> Cane sugar is sucrose. It is a polar molecule as it contains polar carbon-hydrogen and polar carbon-oxygen bonds. When sucrose (sugar) is added to water, sucrose breaks the hydrogen bonds between water molecules. New hydrogen bonds are formed between sucrose and water molecules. Hence, sucrose is readily soluble in water.
> Blood is a colloidal dispersion of red blood cells in plasma. Plasma is a liquid containing water as the major component. When blood is added to water, dispersion of plasma in water results in dilution. Hence, blood is water soluble.
> Oil and ghee are triacylglycerols. They are esters of glycerol with fatty acids. They contain long non polar hydrocarbon chains that are hydrophobic in nature. Hence, oil and ghee do not dissolve in water. Oil and ghee are soluble in non-polar organic solvents such as hexane, toluene etc.

Hence, the options (C) and (D) are the correct options.

Note: Water is considered as a universal solvent. It can dissolve several compounds. Hence it is a good solvent. Water can dissolve more compounds than any other solvent. Hence, water is essential for the survival of life. Plants get minerals from the soil through water. Thus, the water acts as a medium through which minerals from soil can reach plants.