DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ1.22

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ1.22
Level	SL	Paper	1A	Time zone	TZ1
Command term	Determine	Question number	22	Adapted from	N/A

22.

[Maximum mark: 1]

21M.1A.SL.TZ1.22

What is correct for this redox reaction?

MnO₂(s) + 2 $I$ ⁻ (aq) + 4H⁺(aq) → Mn²⁺(aq) + $I$ ₂(aq) + 2H₂O (l)

[1]

Markscheme

A

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.2—Electron transfer reactions » Reactivity 3.2.2—Half-equations separate the processes of oxidation and reduction, showing the loss or gain of electrons. Deduce redox half-equations and equations in acidic or neutral solutions.