The substances which dissolve very little are called soluble substances.
Soluble substances: Those substances which can easily dissolve completely in water are called soluble substances.
For example, if we mix salt or sugar with water it will dissolve completely and make a transparent solution.
So, salt and sugar are Soluble substances.
Insoluble substances: Those substances which cannot dissolve or dissolve very little in water are called insoluble substances
For example, if we mix sand with water it will not dissolve in water
So, sand is an insoluble substance.
Conclusion:
The substances which dissolve very little are called insoluble substances.
Therefore, the given statement is false.