DP Chemistry (last assessment 2024)

Test builder »

Question 19M.2.hl.TZ2.e(i)

Select a Test
Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ2.e(i)
Level hl Paper 2 Time zone TZ2
Command term Suggest Question number e(i) Adapted from N/A
e(i).
[Maximum mark: 1]
19M.2.hl.TZ2.e(i)

Rhenium, Re, was the last element with a stable isotope to be isolated.

Rhenium forms salts containing the perrhenate(VII) ion, ReO4−.

Suggest why the existence of salts containing an ion with this formula could be predicted. Refer to section 6 of the data booklet.

[1]

Markscheme

same group as Mn «which forms MnO4-»
OR
in group 7/has 7 valence electrons, so its «highest» oxidation state is +7    [✔]

Examiners report

This should have been a relatively easy question but many candidates sometimes failed to see the connection with Mn or the amount of electrons in its outer shell.

Syllabus sections