Well when
Zn+H2so4------Znso4+H2
it is single displacement reaction it does not give any colour to solution.

Reaction Overview
When zinc (Zn) is added to dilute sulfuric acid (H2SO4), a chemical reaction occurs, resulting in the formation of zinc sulfate (ZnSO4) and hydrogen gas (H2). The balanced equation for this reaction can be summarized as follows:
- Zn + H2SO4 → ZnSO4 + H2↑
Color of Zinc Sulfate
Zinc sulfate, the product of this reaction, is typically a colorless compound when dissolved in water. However, it can also appear as a white crystalline solid in its hydrated form, commonly known as zinc sulfate heptahydrate (ZnSO4·7H2O).
Key Characteristics
- Appearance:
- Colorless in solution.
- White crystalline solid in hydrated form.
- Solubility:
- Highly soluble in water, contributing to its colorless appearance in dilute solutions.
- Uses:
- Widely used in agriculture as a fertilizer.
- Employed in various industrial processes.
Conclusion
When zinc reacts with dilute sulfuric acid, it produces zinc sulfate, which is colorless in solution and white in its solid form. This property makes it easy to identify in laboratory settings and various applications.