DP Chemistry (first assessment 2025)
Question 19M.2.HL.TZ1.b
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.HL.TZ1.b |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | State | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
19M.2.HL.TZ1.b
State the number of coordinate covalent bonds EDTA forms with Ni2+.
[1]
Markscheme
six [✔]
Examiners report
Proved very challenging with very few candidates knowing the number of coordinate covalent bonds EDTA forms with a nickel ion.
Syllabus sections
Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.4—Electron-pair sharing reactions » Reactivity 3.4.8—Coordination bonds are formed when ligands donate an electron pair to transition element cations, forming complex ions. Deduce the charge on a complex ion, given the formula of the ion and ligands present.