The concept that acid is proton donor and base is proton acceptor was given byA.Arrhenius B.Lowry- BronstedC.LewisD.Faraday

The concept that an acid is a proton donor and a base is a proton acceptor is known as the Brønsted-Lowry theory. Here’s a brief explanation of each option:

A. Arrhenius: Svante Arrhenius proposed that acids produce hydrogen ions (H⁺) in solution and bases produce hydroxide ions (OH⁻). This definition does not account for acid-base reactions in non-aqueous solutions or the role of protons.

B. Lowry-Bronsted: Johannes Nicolaus Brønsted and Thomas Martin Lowry independently developed the idea that acids are proton donors and bases are proton acceptors. This theory expands the definition of acids and bases beyond just aqueous solutions, applying it to a broader range of chemical reactions.

C. Lewis: Gilbert Lewis defined acids as electron pair acceptors and bases as electron pair donors. This is a more general theory than the Brønsted-Lowry theory, but it focuses on electron pairs rather than protons.

D. Faraday: Michael Faraday was known for his work in electromagnetism and electrochemistry, but he did not contribute to the acid-base theory in the same way as the others listed.

Conclusion
The correct answer is B. Lowry-Bronsted, as this is the theory that specifically defines acids as proton donors and bases as proton acceptors.