11.31 Write balanced equations for:
Orthoboric acid on heating gives metaboric acid with the removal of 4 molecules of water and on further heating, metaboric acid converts to tetraboric acid and later on Boron trioxide (boric anhydride)
CBSE Class 12 board exams 2025 to have 50% competency-based questions; no change in 10th
CBSE Class 12 board exams 2024 over; expected result date, trends of last 10 years
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