DP Chemistry (first assessment 2025)

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Question SPM.1A.SL.TZ0.26

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.SL.TZ0.26
Level SL Paper 1A Time zone TZ0
Command term Question number 26 Adapted from N/A
26.
[Maximum mark: 1]
SPM.1A.SL.TZ0.26

The overall reaction occurring at the electrodes of a rechargeable metal hydride battery can be summarized as:

MH + NiO(OH) ⇌ M + Ni(OH)2


Which statement is correct?


A.  The oxidation state of Ni does not change.

B.  M is oxidized by loss of hydrogen.

C.  The oxidation state of one H atom changes from -1 to +1.

D.  The oxidation state of one O atom changes from -1 to -2.

[1]

Markscheme

C