Salt dissolving in water is a physical change. true or false

The correct answer is True.

Salt dissolving in water is a physical change.

In physical change matter does not undergo any change in its chemical composition. In chemical change matter undergoes change in its chemical composition.

When salt (NaCl) dissolves in water it undergoes a change in the state of matter i.e., it gets converted from the solid state to the aqueous state.

Solid NaCl dissociates in water to form Na⁺ cation and Cl⁻ anion. Both the ions get hydrated i.e., surrounded by water molecules.  

NaCl(s) + H₂O--> Na⁺ (aq) + Cl⁻(aq)

NaCl does not undergo any change in its chemical composition, it simply splits into Na⁺ cation and Cl⁻ anion.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.