<span>Cr3+ O2- ; the formula is Cr2O3 ( criss cross)</span>
3 ..............................
<em>Explanation:</em>
<em>safety precautions to be taken when performing diluting concentrated sulphuric acid with water</em>
- Using gloves while diluting to avoid injury from hot sulfuric acid to hands.
- Wearing safety glasses to protect eyes
- Must wear lab coat before performing any chemistry practical
- Safety boots to protect your legs.

C6H10O5 (6 Carbon, 10 Hydrogen and 5 Oxygen)