See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

 3 3 2 2 X H BO NaOH NaBO 2H O           2 2 2 2 2 2 2 2 2 sodium peroxoborate NaBO 2H O 6H O Na OH B O O B OH .6H O         B O O O H O H O O B OH OH 2-