A. . Srivastava, “The Effectiveness of Hands-on Activity Teaching in Learning Acid and Base Concepts at the Secondary Level”, SS, vol. 55, no. 2-3, pp. p.17–20, Sep. 2017, Accessed: Aug. 18, 2025. [Online]. Available: http://ejournals.ncert.gov.in/index.php/SS/article/view/2486