Chahat Arora bettered the National record twice on her way to win the women’s 100m gold medal on the concluding day of the National aquatic championships at the Dr. Zakir Hussain Aquatic Complex here on Saturday. Shivangi Sarma of Assam set a new meet record in women 100m freestyle, with a timing of 57.73. Shivangi Sarma of Assam celebrates after …